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
Monday's through Friday's routes will run one day late.
—
The Arkansas Democrat-Gazette, Arkansas Online, 15 Feb. 2026
For us, Fat Tuesday is one day that sets the tone on how to party.
—Mary Catherine McAnnally Scott, Southern Living, 14 Feb. 2026
Spence arrived for spring training Friday, one day after being acquired in a trade with the A’s.
—Jaylon Thompson, Kansas City Star, 13 Feb. 2026
One occurred close to Sunol one day ago, and the other struck near San Ramon on February 10.
—Ca Earthquake Bot, Sacbee.com, 13 Feb. 2026
See All Example Sentences for one day
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The Arkansas Democrat-Gazette, Arkansas Online, 15 Feb. 2026
For us, Fat Tuesday is one day that sets the tone on how to party.
—Mary Catherine McAnnally Scott, Southern Living, 14 Feb. 2026
Spence arrived for spring training Friday, one day after being acquired in a trade with the A’s.
—Jaylon Thompson, Kansas City Star, 13 Feb. 2026
One occurred close to Sunol one day ago, and the other struck near San Ramon on February 10.
—Ca Earthquake Bot, Sacbee.com, 13 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 19 Feb. 2026.
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