one day

Definition of one day

  1. 1 :  at some time in the future One day, it'll happen. You'll see. People may one day be able to take vacations to the moon.

  2. 2 :  on a day in the past I went to her house one day and had lunch with her. One day, we had a terrible argument.

Word by Word Definitions

  1. :  the time of light between one night and the next

    :  daylight

    :  daytime


Seen and Heard

What made you want to look up one day? Please tell us where you read or heard it (including the quote, if possible).