one day
idiom
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
: 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
With natural, biodegradable, and inexpensive components, such batteries could one day provide an eco-friendly alternative for powering homes or small devices without relying on toxic metals or complex supply chains.
—
Aamir Khollam, Interesting Engineering, 16 Oct. 2025
There are the younger boys who come in one day a week and bring schoolwork, plus the small number of players from outside the region who attend a nearby school and are given additional education.
—George Caulkin, New York Times, 16 Oct. 2025
Republicans are using the conferences and additional press calls to show that their party is united, having centrist lawmakers speak one day and then more conservative fiscal hawks the next.
—Lauren Green, The Washington Examiner, 16 Oct. 2025
Dominique Trenier, [D’Angelo’s former manager], was one of my friends, [and] got in trouble somehow [one day in the nineties].
—Andre Gee, Rolling Stone, 16 Oct. 2025
See All Example Sentences for one day
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Aamir Khollam, Interesting Engineering, 16 Oct. 2025
There are the younger boys who come in one day a week and bring schoolwork, plus the small number of players from outside the region who attend a nearby school and are given additional education.
—George Caulkin, New York Times, 16 Oct. 2025
Republicans are using the conferences and additional press calls to show that their party is united, having centrist lawmakers speak one day and then more conservative fiscal hawks the next.
—Lauren Green, The Washington Examiner, 16 Oct. 2025
Dominique Trenier, [D’Angelo’s former manager], was one of my friends, [and] got in trouble somehow [one day in the nineties].
—Andre Gee, Rolling Stone, 16 Oct. 2025
See All Example Sentences for one day
Cite this Entry
“One day.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/one%20day. Accessed 19 Oct. 2025.
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