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
The space agency revealed the latest problem just one day after targeting March 6 for the Artemis II mission, humanity’s first flight to the moon in more than half a century.
—
Marcia Dunn, Chicago Tribune, 21 Feb. 2026
For many farmers, deciding to lease land to solar panels might be the difference between one day saving or selling their farms, Retter said.
—Sophie Hartley, USA Today, 21 Feb. 2026
For one day anyway, with Olympic gold on the line, that’s going to change.
—Jess Myers, Twin Cities, 21 Feb. 2026
An uninjured LaMelo Ball also played in the game, one day after being involved in a car wreck in the heart of uptown.
—Scott Fowler, Charlotte Observer, 20 Feb. 2026
See All Example Sentences for one day
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Marcia Dunn, Chicago Tribune, 21 Feb. 2026
For many farmers, deciding to lease land to solar panels might be the difference between one day saving or selling their farms, Retter said.
—Sophie Hartley, USA Today, 21 Feb. 2026
For one day anyway, with Olympic gold on the line, that’s going to change.
—Jess Myers, Twin Cities, 21 Feb. 2026
An uninjured LaMelo Ball also played in the game, one day after being involved in a car wreck in the heart of uptown.
—Scott Fowler, Charlotte Observer, 20 Feb. 2026
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 25 Feb. 2026.
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