- Afar:hal
- Afrikaans:'n (af)
- Albanian:një (sq)
- American Sign Language:not used in American Sign Language
- Arabic:not used in Arabic
- Egyptian Arabic:not used in Egyptian Arabic
- Aragonese:un m,una f
- Armenian:մը (hy)(mə)(Western Armenian),մըն(mən)(Western Armenian, before a vowel)
- Asturian:un (ast) m,una (ast) f
- Bakhtiari:یه(ya),یه -ی(ya -i)
- Bashkir:often not used,бер(ber)
- Basque:bat (eu)
- Belarusian:not used in Belarusian
- Belizean Creole:wahn,ahn
- Breton:un (br)(before the letters n, d, t and h),ul (br)(before the letter l),ur (br)(before other letters)
- Bulgarian:not used in Bulgarian
- Burmese:not used in Burmese
- Catalan:un (ca) m,una (ca) f
- Chinese:
- Mandarin:not used in Mandarin
- Cornish:not used in Cornish
- Czech:not used in Czech
- Danish:en (da) c,et (da) n
- Dutch:een (nl)
- Esperanto:not used in Esperanto(but when necessary to express indefiniteness:)iu (eo)(some)
- Estonian:not used in Estonian
- Faroese:ein (fo) f,eitt n
- Fijian:e dua na (fj)
- Finnish:not used in Finnish
- French:un (fr) m,une (fr) f
- Frisian:
- West Frisian:in (fy)
- Friulian:un m,une f
- Galician:un (gl) m,unha (gl) f
- Georgian:not used in Georgian,ერთ-ერთი(ert-erti)(not an article, but used for indicating „one among others“)
- German:ein (de) m orn,eine (de) f
- Alemannic German:en m,e f,es n
- East Central German:aa
- Greek:ένας (el)(énas),μια (el) f(mia)
- Ancient Greek:not used in Ancient Greek
- Haitian Creole:yon
- Hawaiian:he
- Hebrew:(usually omitted; sometimes:)אחד (he)(ekhád)(one)
- Hindi:(usually omitted; sometimes:)एक (hi)(ek)(one)
- Huave:nop
- Hungarian:egy (hu)
- Icelandic:not used in Icelandic
- Ido:not used in Ido
- Indonesian:sebuah (id),seorang (id)
- Ingrian:not used in Ingrian
- Interlingua:un (ia)
- Irish:not used in Irish
- Old Irish:not used in Old Irish
- Istriot:oûn m,oûna f
- Italian:un (it) m,uno (it) m,una (it) f,un' (it) f(before a vowel)
- Japanese:not used in Japanese
- Jeju:not used in Jeju
- Kannada:ಒಂದು (kn)(ondu)
- Karelian:not used in Karelian
- Korean:not used in Korean
- Kurdish:
- Northern Kurdish:yek (ku),-ek (ku),-yek (ku)
- Latin:not used in Latin(Old, Classical, Late, New Latin, sometimes in Medieval Latin);unus (la)(sometimes in Medieval Latin)
- Ligurian:un m,'n m,ùnn-a f,'na f
- Limburgish:'n (li) f,ene m,e (li) n
- Lithuanian:not used in Lithuanian
- Livonian:not used in Livonian
- Louisiana Creole:un,in,unn,ènn
- Low German:een (nds),en (nds),ein
- Ludian:not used in Ludian
- Luxembourgish:eng (lb)
- Macedonian:not used in Macedonian
- Malay:not used in Malay
- Manx:not used in Manx
- Māori:he
- Middle English:a(primarily before a consonant),an(primarily before a vowel)
- Mirandese:un m,ũa f
- Mòcheno:a m (nominative)andfandn,an m (oblique)
- Norwegian:
- Bokmål:en (no) m,ei (no) f,et (no) n
- Nynorsk:ein (nn) m,ei (nn) f,eit n
- Occitan:un (oc) m,una (oc) f,ua (oc) f (Gascon)
- Old English:not used in Old English
- O'odham:g
- Pennsylvania German:en
- Persian:
- Dari:یک (fa)(yak),ـی(-ē),یه(ya)(colloquial)
- Iranian Persian:یک (fa)(yek),-ی (fa)(-i),یک -ی(yek -i),یه(ye)(colloquial),یه -ی(ye -i)(colloquial)
- Polish:not used in Polish
- Portuguese:um (pt) m,uma (pt) f
- Romani:jekh
- Romanian:un (ro) m orn,o (ro) f
- Russian:not used in Russian
- Sami:
- Akkala Sami:not used in Akkala Sami
- Inari Sami:not used in Inari Sami
- Kemi Sami:not used in Kemi Sami
- Kildin Sami:not used in Kildin Sami
- Lule Sami:not used in Lule Sami
- Northern Sami:not used in Northern Sami
- Pite Sami:not used in Pite Sami
- Skolt Sami:not used in Skolt Sami
- Southern Sami:not used in Southern Sami
- Ter Sami:not used in Ter Sami
- Ume Sami:not used in Ume Sami
- Sanskrit:not used in Sanskrit
- Scottish Gaelic:not used in Scottish Gaelic
- Serbo-Croatian:not used in Serbo-Croatian
- Slovak:not used in Slovak
- Slovene:not used in Slovene
- Sorbian:
- Lower Sorbian:not used in Lower Sorbian
- Upper Sorbian:not used in Upper Sorbian
- Spanish:un (es) m,una (es) f
- Swahili:not used in Swahili
- Swedish:en (sv) c,ett (sv) n
- Tagalog:(describe the quantity of something)isang (tl)
- Tamil:(used before the noun)ஒரு (ta)(oru),ஒன்று (ta)(oṉṟu)(used after the noun)
- Telugu:ఒక (te)(oka)
- Thai:หนึ่ง (th)(nʉ̀ng)
- Tok Pisin:wanpela (tpi)
- Turkish:not used in Turkish,bir (tr),bi',bi (tr)
- Tz'utujil:jun
- Ukrainian:not used in Ukrainian
- Veps:not used in Veps
- Vietnamese:not used in Vietnamese
- Volapük:(♂♀, animate or inanimate, extremely rare, usually not translated)un,(♂, extremely rare, usually not translated)hiun,(♀, extremely rare, usually not translated)jiun
- Võro:not used in Võro
- Votic:not used in Votic
- Walloon:on (wa) m,ene (wa) f,èn (wa) m(before vowel)
- Welsh:not used in Welsh
- Middle Welsh:not used in Middle Welsh
- Wolof:ab (wo)
- Yiddish:אַ (yi)(a),אַן(an)
- Yoruba:not used in Yoruba
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