Meaning of the word "one day" in English

What does "one day" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

one day

US /wʌn deɪ/
UK /wʌn deɪ/

Phrase

at some unspecified time in the future or past

Example:
One day, I'll travel around the world.
I remember one day, we went fishing by the lake.