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

Cypress voters are supporting by more than 57% zoning changes to allow for an additional 676 homes to one day be built at the Los Alamitos Race Course – for a total of up to 1,791. —Heather McRea, Orange County Register, 6 Nov. 2024

Ellie is the girl her mother ran into that one day, and the baby Ellie sees in Celeste’s arms in 2005 is her. —Laura Bradley, Vulture, 5 Nov. 2024

Just one day after wrapping the U.S. dates of her Eras Tour, Swift made her way to Kansas City on Monday, Nov. 4 to cheer on boyfriend Travis Kelce as his undefeated Chiefs take on the Tampa Bay Buccaneers. —Rachel Desantis, People.com, 5 Nov. 2024

With just one day before the U.S. presidential election, both political and investing pundits are bombarding us with their advice on who will win and where the stock market will go. —Tom Aspray, Forbes, 4 Nov. 2024