one day

phrase

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

Willis, who was one of the group's founders in the 1970s, died one day shy of his 75th birthday. — Melina Khan, USA Today, 1 July 2026

Artificial intelligence could one day supercharge human cognition, leading to significant advances in science, technology and other fields. — Megan Cerullo, CBS News, 30 June 2026

The Panthers on Tuesday, one day before the start of free agency, traded for Jacob Markstrom and forward Angus Crookshank from the New Jersey Devils in exchange for forwards Evan Rodrigues and Jesper Boqvist plus prospect Ben Steeves. — Jordan McPherson, Miami Herald, 30 June 2026

Unlike other design firms, AI is not a major tool for Kartell, but might be one day, to speed communications and efficiencies with clients. — David Moin, Footwear News, 30 June 2026

Rhymes for one day

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