one day

idiom

: 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.

: 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.

Examples of one day in a Sentence

Recent Examples on the Web Collections for the remainder of the week will be delayed one day before returning to normal. —

Cole Behrens, The Enquirer, 12 June 2024 Jennifer [Aniston] got chased in by a stalker one day, driving crazy to get onto the Warner Bros. lot. —

Whitney Friedlander, Los Angeles Times, 12 June 2024 Karen Johnson, 55, of Cumberland, was ordered to serve one year and one day in prison for wire fraud, followed by three years of supervised release. —

Chris Ramirez, Journal Sentinel, 11 June 2024 Before King Charles, 75, named Prince William and Kate Middleton as the new Prince and Princess of Wales one day after Queen Elizabeth's death in Sept. 2022, the monarch held the title of the Prince of Wales as heir. —

Stephanie Petit, Peoplemag, 11 June 2024 See all Example Sentences for one day

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'one day.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.