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 breakthrough method holds the potential to one day help people regain function after paralysis.
—
Aamir Khollam, Interesting Engineering, 5 Sep. 2025
Then one day, good Samaritans made a furry discovery under their car.
—Simone Jasper, Charlotte Observer, 4 Sep. 2025
Just one day prior, Rivera hosted an event showcasing the doll that has inspired several entries in The Conjuring movie franchise.
—Shania Russell, Entertainment Weekly, 4 Sep. 2025
That location opened just one day before another new store in Brunswick, on Georgia’s southeast coast.
—Saman Shafiq, USA Today, 4 Sep. 2025
See All Example Sentences for one day
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Aamir Khollam, Interesting Engineering, 5 Sep. 2025
Then one day, good Samaritans made a furry discovery under their car.
—Simone Jasper, Charlotte Observer, 4 Sep. 2025
Just one day prior, Rivera hosted an event showcasing the doll that has inspired several entries in The Conjuring movie franchise.
—Shania Russell, Entertainment Weekly, 4 Sep. 2025
That location opened just one day before another new store in Brunswick, on Georgia’s southeast coast.
—Saman Shafiq, USA Today, 4 Sep. 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 9 Sep. 2025.
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