one day
The phrase 'one day' is often used to refer to an unspecified point in time, either in the past or future, and can also simply mean a single day.
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Definition
A2General
(expression, future)At an unspecified time in the future.
Example
- I hope to visit Japan one day.
- One day, I'll run a marathon.
A2General
(expression, past)At an unspecified time in the past.
Example
- One day, I found an old photo album in the attic.
- I met my best friend one day at a local café.
A1General
A period of 24 hours, typically from midnight to midnight.
Example
- There are 24 hours in one day.
- She finished the book in just one day.
Similar
Terms that have similar or relatively close meanings to "one day":
the dayday by dayfrom day to dayday onefrom one day to the nextevery daya year and a daygood daybig daythe other dayday of daysfor dayshalf dayterm dayall dayone momentfor oneworking day