Phrase guide

light year

noun · 4 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: /ˈlaɪt.jɪə/
  • General-American: /ˈlaɪt.jɪɹ/
  • General-South-African: /ˈläːt.jøː/
  • Wales: /ˈlaɪt.jɜː/
  • US: Recorded audio is listed in the source snapshot.

1

noun

Meaning 1

A unit of length used to measure extremely large distances, equal to approximately 9.46 trillion kilometres 10 trillion kilometres (1016 metres), equivalent to the distance light travels in one Julian year.

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

2

noun

Meaning 2

A very long way.

Definition source: English Wiktionary via Wiktextract

Usage: figuratively, in-plural, informal

Examples

  • The marathon runner in the lead is light years ahead of the one at the back.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A very long time.

Definition source: English Wiktionary via Wiktextract

Usage: figuratively, in-plural, informal

Examples

  • Some of Leonardo da Vinci’s inventions were light years ahead of their time.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: light-year

Antonyms: none provided

Broader terms: astronomy unit

History

Etymology

No etymology was provided for this word.

Across languages

Translations

94 source translations are retained for this English entry.

  • Afrikaans: ligjaar — unit of astronomical distance
  • Albanian: dritëviti — unit of astronomical distance
  • Arabic: سَنَة ضَوْئِيَّة (sana ḍawʔiyya) — unit of astronomical distance
  • Aragonese: año luz — unit of astronomical distance
  • Armenian: լուսատարի (lusatari) — unit of astronomical distance
  • Asturian: añu lluz — unit of astronomical distance
  • Basque: argi-urte — unit of astronomical distance
  • Belarusian: светлавы́ год (svjetlavý hod) — unit of astronomical distance
  • Bengali: আলোক বর্ষ (alōk borśo) — unit of astronomical distance
  • Breton: bloavezh-gouloù — unit of astronomical distance
  • Bulgarian: светли́нна годи́на (svetlínna godína) — unit of astronomical distance
  • Burmese: အလင်းနှစ် (a.lang:hnac) — unit of astronomical distance
  • Catalan: any llum — unit of astronomical distance
  • Chinese Cantonese: 光年 (gwong1 nin4) — unit of astronomical distance
  • Chinese: 光年 (kng-nî) — unit of astronomical distance
  • Chinese Mandarin: 光年 (guāngnián) — unit of astronomical distance
  • Czech: světelný rok — unit of astronomical distance
  • Danish: lysår — unit of astronomical distance
  • Dutch: lichtjaar — unit of astronomical distance
  • Esperanto: lumjaro — unit of astronomical distance
  • Estonian: valgusaasta — unit of astronomical distance
  • Faroese: ljósár — unit of astronomical distance
  • Finnish: valovuosi — unit of astronomical distance
  • French: année-lumière — unit of astronomical distance
  • Galician: ano luz — unit of astronomical distance
  • Georgian: სინათლის წელიწადი (sinatlis c̣elic̣adi) — unit of astronomical distance
  • German: Lichtjahr — unit of astronomical distance
  • Greek: έτος φωτός (étos fotós) — unit of astronomical distance
  • Gujarati: પ્રકાશવર્ષ (prakāśvarṣ) — unit of astronomical distance
  • Hebrew: שנת אור — unit of astronomical distance
  • Hindi: प्रकाशवर्ष (prakāśvarṣ) — unit of astronomical distance
  • Hungarian: fényév — unit of astronomical distance
  • Icelandic: ljósár — unit of astronomical distance
  • Ido: lumyaro — unit of astronomical distance
  • Indonesian: tahun cahaya — unit of astronomical distance
  • Irish: solasbhliain — unit of astronomical distance
  • Italian: anno luce — unit of astronomical distance
  • Japanese: 光年 (kōnen) — unit of astronomical distance
  • Kannada: ಜ್ಯೋತಿರ್ವರ್ಷ (jyōtirvarṣa) — unit of astronomical distance
  • Kazakh: жарық жылы (jaryq jyly) — unit of astronomical distance
  • Korean: 광년 (gwangnyeon) — unit of astronomical distance
  • Northern Kurdish: saletîrêj — unit of astronomical distance
  • Kyrgyz: жарык жылы (jarık jılı) — unit of astronomical distance
  • Lao: ປີແສງ (pī sǣng) — unit of astronomical distance
  • Latin: spatium lucis annuae — unit of astronomical distance
  • Latvian: gaismas gads — unit of astronomical distance
  • Limburgish: Leechjaor — unit of astronomical distance
  • Lithuanian: šviẽsmetis — unit of astronomical distance
  • Luxembourgish: Liichtjoer — unit of astronomical distance
  • Macedonian: светлосна година (svetlosna godina) — unit of astronomical distance
  • Malay: tahun cahaya — unit of astronomical distance
  • Maltese: sena dawl — unit of astronomical distance
  • Mongolian: гэрлийн жил (gerliin žil) — unit of astronomical distance
  • Norwegian Bokmål: lysår — unit of astronomical distance
  • Norwegian Nynorsk: lysår — unit of astronomical distance
  • Norwegian Nynorsk: ljosår — unit of astronomical distance
  • Oromo: wagga iffa — unit of astronomical distance
  • Persian: سال نوری (sâl-e nuri) — unit of astronomical distance
  • Polish: rok świetlny — unit of astronomical distance
  • Portuguese: ano-luz — unit of astronomical distance
  • Quechua: achkiy wata — unit of astronomical distance
  • Romanian: an-lumină — unit of astronomical distance
  • Russian: светово́й год (svetovój god) — unit of astronomical distance
  • Serbo-Croatian: свјетлосна година — unit of astronomical distance
  • Serbo-Croatian: светлосна година — unit of astronomical distance
  • Serbo-Croatian: svjetlosna godina — unit of astronomical distance
  • Serbo-Croatian: svetlosna godina — unit of astronomical distance
  • Sicilian: annu luci — unit of astronomical distance
  • Slovak: svetelný rok — unit of astronomical distance
  • Slovene: svetlòbno léto — unit of astronomical distance
  • Lower Sorbian: swětłowe lěto — unit of astronomical distance
  • Spanish: año luz — unit of astronomical distance
  • Swahili: mwaka wa nuru — unit of astronomical distance
  • Swedish: ljusår — unit of astronomical distance
  • Tagalog: sinag-taon — unit of astronomical distance
  • Tajik: соли нур (sol-i nur) — unit of astronomical distance
  • Tamil: ஒளியாண்டு (oḷiyāṇṭu) — unit of astronomical distance
  • Telugu: కాంతిసంవత్సరము (kāntisaṁvatsaramu) — unit of astronomical distance
  • Thai: ปีแสง (bpii-sɛ̌ɛng) — unit of astronomical distance
  • Tibetan: འོད་ལོ ('od lo) — unit of astronomical distance
  • Turkish: ışık yılı — unit of astronomical distance
  • Turkmen: ýagtylyk ýyly — unit of astronomical distance
  • Ukrainian: світлови́й рік (svitlovýj rik) — unit of astronomical distance
  • Urdu: نوری سال (norī sāl) — unit of astronomical distance
  • Uzbek: yorugʻlik yili — unit of astronomical distance
  • Vietnamese: năm ánh sáng — unit of astronomical distance
  • Welsh: blwyddyn golau — unit of astronomical distance
  • Chinese Mandarin: 遙遙領先 /遥遥领先 (yáoyáolǐngxiān) — a very long way
  • Faroese: ljósár — a very long way
  • Finnish: valovuosi — a very long way
  • Hungarian: fényévek — a very long way
  • Italian: anni luce — a very long way
  • Slovene: svetlòbno léto — a very long way
  • Swedish: ljusår — a very long way