- Once means one time.
An example of once is doing something one day each week, once a week.
- Once is defined as whenever or as soon as.
An example of once is saying when your friend arrives you'll be leaving, you'll leave once your friend arrives.
once definition by Webster's New World
- one time; one time only: to eat once a day
- at any time; at all; ever: she'll succeed if once given a chance
- at some time in the past; formerly: a once famous man
- by one degree or grade: a cousin once removed
Origin: Middle English ones, genitive of on, one
once definition by American Heritage Dictionary
- One time only: once a day.
- At one time in the past; formerly.
- At any time; ever: Once known, his face is never forgotten.
- By one degree of relationship: my first cousin once removed.
Origin: Middle English ones, from on, one, from Old English ān; see oi-no- in Indo-European roots.
once - Phrases/Idioms
all at once
- all at the same time
- at the same time
once and again
once (and) for all
once in a while
once or twice
once upon a time
- All at one time; simultaneously: Everything happened at once. The view of the skyline is at once awesome, grand, and disappointing.
- Immediately; instantly: Leave the room at once.