Standard Lemma guide

equinox

noun · 7 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Received-Pronunciation: /ˈɛkwɪnɒks/
  • Received-Pronunciation: /ˈiː-/
  • Southern-England: Recorded audio is listed in the source snapshot.
  • Southern-England: Recorded audio is listed in the source snapshot.
  • General-American: /ˈɛkwəˌnɑks/
  • General-American: /ˈi-/
  • Canada: /ˈɛkwɪˌnɑks/
  • Canada: /ˈiː-/
  • General-American: Recorded audio is listed in the source snapshot.
  • Received-Pronunciation: /ˌɛkwɪˈnɒktiːz/
  • Received-Pronunciation: /ˌiː-/
  • General-American: /ˌɛkwəˈnɑktiz/
  • General-American: /ˌi-/
  • Canada: /ˌɛkwɪˈnɑktiz/
  • Canada: /ˌi-/
  • CMU ARPABET: IY1 K W AH0 N AA2 K S Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

One of two times in the year (one in March and the other in September) when the length of the day and the night are equal, which occurs when the sun is directly overhead at the equator; this marks the beginning of spring in one hemisphere and autumn in the other.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: evennight

Antonyms: none provided

2

noun

Meaning 2

The circumstance of a twenty-four hour time period having the day and night of equal length.

Definition source: English Wiktionary via Wiktextract

Usage: also, figuratively

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

One of the two points in space where the apparent path of the Sun intersects with the equatorial plane of the Earth.

Definition source: English Wiktionary via Wiktextract

Topics: astronomy, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

A gale (“very strong wind”) once thought to occur more frequently around the time of an equinox (sense 1), now known to be a misconception; an equinoctial gale.

Definition source: English Wiktionary via Wiktextract

Usage: obsolete, rare

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

A celestial equator (“great circle on the celestial sphere, coincident with the plane of the Earth's equator (the equatorial plane)”); also, the Earth's equator.

Definition source: English Wiktionary via Wiktextract

Usage: obsolete

Topics: astronomy, natural-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: equinoctial line

Antonyms: none provided

6

noun

Meaning 6

(astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: equinoctial point

Antonyms: none provided

Broader terms: celestial point

Narrower terms: vernal equinox, autumnal equinox

7

noun

Meaning 7

either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: cosmic time

Narrower terms: vernal equinox, March equinox, spring equinox, autumnal equinox, September equinox, fall equinox

History

Etymology

PIE word *nókwts From Middle English equinox, equinoxe, equynox (“one of the two periods in the year when the day and night are of equal length, equinox; either the zodiac sign Aries or Libra, in which the sun crosses the celestial equator”), from Old French equinoce, equinoxe (modern French équinoxe), or from its etymon Medieval Latin ēquinoxium, ēquinoctium, from Latin aequinoctium (“equinox”), from aequus (“equal”) + nox (“night”) (ultimately derived from Proto-Indo-European *nókwts (“night”)) + -ium (suffix forming abstract nouns). The Latin word, ultimately adopted in Middle English and modern English, displaced Old English efnniht (modern English evennight). The rare alternative plural form equinoctes treats equinox as if it were a Latin word; the plural of Latin nox (“night”) is noctēs.

Across languages

Translations

117 source translations are retained for this English entry.

  • Afrikaans: dag-en-nag-ewening — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Albanian: ekuinoks — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Arabic: اِعْتِدَال (iʕtidāl) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Armenian: գիշերահավասար (gišerahavasar) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Asturian: equinocciu — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Azerbaijani: ekinoks — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Azerbaijani: gecə-gündüzün bərabərliyi — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Banjarese: ekuinoks — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Basque: ekinokzio — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Belarusian: раўнадзе́нства (rawnadzjénstva) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Bengali: বিষুব (biśub) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Breton: kedez — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Bulgarian: равноде́нствие (ravnodénstvie) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Catalan: equinocci — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Chinese Mandarin: 二分點 /二分点 (èrfēndiǎn) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Chinese Mandarin: 分點 /分点 (fēndiǎn) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Chinese Mandarin: 晝夜平分點 /昼夜平分点 (zhòuyè píngfēndiǎn) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Czech: rovnodennost — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Czech: ekvinokce — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Czech: ekvinokcium — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Danish: jævndøgn — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Dutch: equinox — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Dutch: dag-en-nachtevening — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Dutch: nachtevening — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Esperanto: ekvinokso — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Esperanto: tagnoktegaleco — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Estonian: pööripäev — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Estonian: võrdpäevsus — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Faroese: javndøgur — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Finnish: päiväntasaus — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • French: équinoxe — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Old Frisian: evennacht — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Galician: equinoccio — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Georgian: ბუნიაობა (buniaoba) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Georgian: ბუნიობა (bunioba) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Georgian: დღეღამტოლობა (dɣeɣamṭoloba) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • German: Äquinoktium — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • German: Tagnachtgleiche — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • German: Tagundnachtgleiche — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Greek: ισημερία (isimería) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Ancient Greek: ἰσημερία (isēmería) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Gujarati: સમપ્રકાશીય ઘટના કે વિષુવકાલ (samaprakāśīya ghaṭnā ke viṣuvkāl) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Hebrew: נקודת השוויון — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Hindi: विषुव (viṣuv) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Hungarian: nap-éj egyenlőség — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Icelandic: jafndægur — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Ido: equinoxo — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Indonesian: ekuinoks — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Interlingua: equinoctio — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Irish: cónocht — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Italian: equinozio — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Japanese: 分点 (bunten) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Kannada: ವಿಷುವತ್ ಸಂಕ್ರಾಂತಿ (viṣuvat saṅkrānti) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Khmer: សមភាពរាត្រី (saʼmaʼphiəp riətrəy) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Khmer: សមរាត្រី (saʼmaʼ riətrəy) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Khmer: វិសុវ័ត (visovŏət) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Korean: 분점 (bunjeom) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Lao: ວິສຸວັດ (wi su wat) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Latin: aequinoctium — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Latvian: ekvinokcija — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Lithuanian: ekvinokcija — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Lithuanian: lygiadienis — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Luxembourgish: equinoxe — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Macedonian: рамноде́ница (ramnodénica) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Macedonian: рамнодне́вица (ramnodnévica) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Malagasy: ekinôksa — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Malay: ekuinoks — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Malayalam: വിഷുവം (viṣuvaṁ) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Māori: pahore o Rehua — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Norman: étchinosse — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Norman: êtchinnoxe — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Norwegian Bokmål: jevndøgn — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Norwegian Nynorsk: jamdøgn — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Occitan: equinòcci — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Old English: efnniht — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Old Norse: jafndœgri — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Persian: برابران (barâbarân) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Persian: اعتدال (e'tedâl) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Polish: ekwinokcjum — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Polish: równonoc — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Portuguese: equinócio — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Prakrit: 𑀯𑀺𑀲𑀼𑀯 (visuva) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Punjabi: ਸਮਰਾਤ (samrāt) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Romanian: echinox — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Romanian: echinocțiu — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Russian: равноде́нствие (ravnodénstvije) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Sanskrit: विषुव (viṣuva) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Sardinian: ecuinòtziu — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Scottish Gaelic: co-fhad-thràth — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Serbo-Croatian: равно̀дневица — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Serbo-Croatian: равнодневница — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Serbo-Croatian: ravnòdnevica — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Serbo-Croatian: ravnodnevnica — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Slovak: ekvinokcium — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Slovak: rovnodennosť — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Slovene: ekvinokcij — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Slovene: enakonočje — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Spanish: equinoccio — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Swahili: ikwinoksi — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Swahili: sikusare — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Swedish: dagjämning — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Tagalog: ekinoksiyo — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Tajik: эътидол (e'tidol) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Tamil: சம இரவு நாள் (cama iravu nāḷ) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Tamil: விடுவம் (viṭuvam) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Telugu: విషువత్తు (viṣuvattu) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Thai: วิษุวัต (wít-sù-wát) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Turkish: ekinoks — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Turkish: ılım — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Ukrainian: рівноде́ння (rivnodénnja) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Urdu: اِعْتِدال (i'tidāl) — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Uzbek: tengkunlik — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Vietnamese: điểm phân — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Welsh: cyhydnos — one of the two times in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Finnish: päiväntasaus — circumstance of a twenty-four hour time period having the day and night of equal length
  • Cebuano: kilingan — one of the two points in space where the apparent path of the Sun intersects with the equatorial plane of the Earth
  • Finnish: tasauspiste — one of the two points in space where the apparent path of the Sun intersects with the equatorial plane of the Earth
Real reading context

equinox in complete knowledge articles