We found 17 dictionaries that define the word ONE DAY:

General (12 matching dictionaries)

1. one day: Merriam-Webster
2. one day, one day: Oxford Learner's Dictionaries
3. one-day, one-day: Collins English Dictionary
4. One-Day, One-day, one-day, one day: Wordnik
5. one day: Cambridge Advanced Learner's Dictionary
6. one-day, one day: Wiktionary
7. One day, one day: Dictionary.com
8. One Day (Charice song), One Day (Electric Light Orchestra song), One Day (Klymaxx album), One Day (Kodaline song), One Day (Logic and Ryan Tedder song), One Day (Logic song), One Day (Matisyahu song), One Day (One single), One Day (Opshop song), One Day (Vandaag), One Day (band), One Day (disambiguation), One Day (novel), One Day (single album), One Day: Wikipedia, the Free Encyclopedia
9. one day: FreeDictionary.org
10. One day: TheFreeDictionary.com

Business (1 matching dictionary)

11. One Day: Legal dictionary

Computing (1 matching dictionary)

12. One Day: Encyclopedia

Medicine (1 matching dictionary)

13. One Day: Medical dictionary

Miscellaneous (1 matching dictionary)

14. one day: Idioms

Slang (1 matching dictionary)

15. one day: Urban Dictionary

Definitions from Wiktionary (one day) ▸ adverb:  (set phrase) At some unspecified time in the future. ▸ adverb:  At some unspecified time in the past. ▸ adverb:  Used other than figuratively or idiomatically: see one, day. Similar: sooner or later, sometime, mañana, tomorrow, one of these days, some time yet, soonish, paulo post futurum, ahead, meanwhile, more... Opposite: night, 24 hours, diurnal cycle Types: tomorrow, yesterday, today, 24 hours, more... Phrases: one day wonder, from one day to the next, One Day at a Time, One Day International, one fine day, more... Adjectives: sometime, now, whilom, late, then, still, sometyme, anon, soon, whilome, today ▸ Words similar to ONE DAY ▸ Usage examples for ONE DAY ▸ Idioms related to ONE DAY ▸ Wikipedia articles (New!) ▸ Words that often appear near ONE DAY ▸ Rhymes of ONE DAY ▸ Invented words related to ONE DAY