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
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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