once is one of the 1000 most common headwords.
on - once - one
English numbers (edit)
1 2  → 
    Cardinal: one
    Ordinal: first
    Frequency: once
    Multiplier: single
    Distributive: singly
    Fractional: whole
    Number of musicians: solo

Pronunciation change

Determiner change

Determiner
once

  1. (indefinite) one time
    We go to the house once a year.
    She had only seen him once.
    It's nice to be understood for once.
    We get together once a month for coffee.
    Not once have I said that.
  2. (indefinite) at a time in the past, but not now
    It was hard to believe that once we had been friends.
    The once great city had be destroyed.

Preposition change

Preposition
once

  1. after
    Once I've finished cleaning up, we can leave.

Related words change