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 news comes one day after the governor of Louisiana said Woodward would not be allowed to hire former Tigers coach Brian Kelly’s replacement.
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The Athletic Staff, New York Times, 31 Oct. 2025
The doting mom tells PEOPLE that her daughter came across the Halloween decor item one day and has kept it around with her ever since.
—Kayla Grant, PEOPLE, 31 Oct. 2025
However, one day after the assistance was offered, the Cuban government declined the offer.
—Thao Nguyen, USA Today, 30 Oct. 2025
Today’s deal comes one day after the 15th anniversary of the game that clinched the 2010 title for the team.
—Tom Tapp, Deadline, 30 Oct. 2025
See All Example Sentences for one day
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The Athletic Staff, New York Times, 31 Oct. 2025
The doting mom tells PEOPLE that her daughter came across the Halloween decor item one day and has kept it around with her ever since.
—Kayla Grant, PEOPLE, 31 Oct. 2025
However, one day after the assistance was offered, the Cuban government declined the offer.
—Thao Nguyen, USA Today, 30 Oct. 2025
Today’s deal comes one day after the 15th anniversary of the game that clinched the 2010 title for the team.
—Tom Tapp, Deadline, 30 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 31 Oct. 2025.
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