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 hope is that one day when tricorders are used and purveyors of longevity miracles have long since passed, so too will faxes no longer be needed in healthcare. —Seth Joseph, Forbes, 18 Mar. 2025

Tracy Morgan shares an update one day after his courtside medical incident at the New York Knicks game. —Charna Flam, People.com, 18 Mar. 2025

Starliner launched from Cape Canaveral Space Force Station on June 5, 2024, docking with the space station one day later. —Richard Tribou, Orlando Sentinel, 18 Mar. 2025

Finding value The Singapore Tourism Board has been trying to change the perception that Singapore is expensive by emphasizing how much a visitor can do in one day thanks to Singapore’s public transport system, a point that Cross also made. —Kevin Lim, CNBC, 17 Mar. 2025

Rhymes for one day

• aaa
• adonais
• alleyway
• alumnae
• anime
• anyway
• arete
• attache
• baa
• beaujolais
• bouvier
• breakaway