one day

adverb
UK: /ˌwʌn ˈdeɪ/
US: /ˌwʌn ˈdeɪ/

  1. At some point in the future.

    1. One day, I will travel to Japan. [ ] [ ]
    2. I hope that one day we can meet again to discuss this interesting topic further. [ ] [ ]

  2. Used to refer to a particular day in the past, without specifying which day.

    1. One day I saw a cat. [ ] [ ]
    2. One day last year, I happened to be walking past his house and saw him leave. [ ] [ ]

Synonyms

sometime eventually someday
one day noun

  1. A period of twenty-four hours.

    1. It happened just one day ago. [ ] [ ]
    2. The journey will take one day, so pack accordingly for the trip. [ ] [ ]

Frequently Asked Questions

The word "one day" in English means: At some point in the future., Used to refer to a particular day in the past, without specifying which day..

The phonetic transcription of "one day" is /ˌwʌn ˈdeɪ/ in British English and /ˌwʌn ˈdeɪ/ in American English. Click the 🔊 button to hear both pronunciations.

Synonyms for "one day": sometime, eventually, someday.

Example usage of "one day": "One day, I will travel to Japan.". More examples on the page.