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
Hence, scientists are exploring ways to build three-dimensional molecular electronics that could one day outperform silicon chips.
—
Bojan Stojkovski, Interesting Engineering, 31 Jan. 2026
What’s pulled one day is there the next.
—Sun Sentinel Editorial Board, Sun Sentinel, 31 Jan. 2026
Access to Eudēmonia costs about $400 for one day and $1,200 for three days.
—Sandee Lamotte, CNN Money, 31 Jan. 2026
Training exercises like the flight simulation allow the dogs to better serve the visually impaired who may be in need of a guide dog one day.
—Daily News, 31 Jan. 2026
See All Example Sentences for one day
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Bojan Stojkovski, Interesting Engineering, 31 Jan. 2026
What’s pulled one day is there the next.
—Sun Sentinel Editorial Board, Sun Sentinel, 31 Jan. 2026
Access to Eudēmonia costs about $400 for one day and $1,200 for three days.
—Sandee Lamotte, CNN Money, 31 Jan. 2026
Training exercises like the flight simulation allow the dogs to better serve the visually impaired who may be in need of a guide dog one day.
—Daily News, 31 Jan. 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 2 Feb. 2026.
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