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