one day

English edit

(set phrase) At some unspecified time in the future.
Synonyms: one of these days, some day; see also Thesaurus:one day

One day I shall upgrade my software, but not just yet.
At some unspecified time in the past.
Synonym: once

One day I was playing with a girl from my class.
- 1913, Joseph C[rosby] Lincoln, chapter XI, in Mr. Pratt’s Patients, New York, N.Y., London: D[aniel] Appleton and Company, →OCLC:
  One day I was out in the barn and he drifted in. I was currying the horse and he set down on the wheelbarrow and begun to ask questions.
Used other than figuratively or idiomatically: see one,‎ day.
You can stay one day or two.

at unspecified time in the future

Arabic: مَرَّةً (ar) (marratan), يَوْمًا (yawman)
Belarusian: не́калі (njékali), калі́-не́будзь (kalí-njébudzʹ)
Bengali: একদিন (bn) (ekdin)
Catalan: un dia m
Chinese:
Mandarin: 某一天 (mǒu yī tiān), 有一天 (zh) (yǒu yī tiān), 一天 (zh) (yī tiān)
Czech: někdy (cs)
East Central German: aanstoochs
Esperanto: iam (eo)
Finnish: jonakin päivänä, joskus (fi)
French: un jour (fr)
Georgian: როდისმე (rodisme)
German: eines Tages (de)
Greek: κάποια μέρα (kápoia méra)
Hungarian: egy napon, egy szép napon, egyszer majd, majd valamikor
Italian: un giorno o l'altro
Japanese: いつか (ja) (itsuka)
Korean: 언젠가 (ko) (eonjen'ga)
Latin: olim (la)
Macedonian: еден ден (eden den)
Malayalam: ഒരു ദിവസം (oru divasaṁ), ഒരിക്കൽ (ml) (orikkal)
Maltese: jum fost l-oħrajn
Middle English: ones
Norwegian:
Bokmål: en gang, en dag

Nynorsk: ein gong, ein dag
Persian: یک روز (yek ruz), یکروز (fa) (yekruz)
Polish: kiedyś (pl), pewnego dnia
Portuguese: algum dia
Romanian: într-o zi
Russian: одна́жды (ru) (odnáždy), когда́-нибу́дь (ru) (kogdá-nibúdʹ), когда́-то (ru) (kogdá-to)
Scottish Gaelic: latha de na làithean, lath'-eigin
Slovak: niekedy
Spanish: algún día (es)
Swedish: en vacker dag (sv)
Tagalog: balang araw
Tamil: ஒரு நால் (oru nāl)
Turkish: bir gün
Ukrainian: коли́сь (kolýsʹ), коли́-не́будь (kolý-nébudʹ)

at unspecified time in the past

Arabic: فِي يَوْم مِن اَلْأَيَّام (fī yawm min al-ʔayyām)
Bengali: একদিন (bn) (ekdin), একদা (bn) (ekoda)
Chinese:
Mandarin: 一天 (zh) (yī tiān)
East Central German: aanstoochs
Finnish: eräänä päivänä
French: un jour (fr)
German: eines Tages (de)
Greek: κάποτε (el) (kápote)
Hungarian: egy napon, egy szép napon, egyszer (hu)
Italian: una volta
Japanese: ある日 (aru hi)
Korean: 어느 날 (eoneu nal), 하루는 (haruneun)
Latin: olim (la)
Malayalam: ഒരിക്കൽ (ml) (orikkal), ഒരു ദിവസം (oru divasaṁ)
Maltese: jum fost l-oħrajn
Maore Comorian: suku class 9
Middle English: ones, enes
Portuguese: uma vez
Romanian: într-o zi
Russian: одна́жды (ru) (odnáždy), когда́-то (ru) (kogdá-to), ка́к-то (ru) (kák-to)
Scottish Gaelic: latha a bha seo, latha de na làithean
Serbo-Croatian: jednoga dana
Tagalog: isang araw
Tamil: பின்னால் (ta) (piṉṉāl)
Turkish: bir gün
Welsh: undydd m