Once
WordNet
adverb
(1) On one occasion
"Once I ran into her"
(2) At a previous time
"At one time he loved her"
"Her erstwhile writing"
"She was a dancer once";
(3) As soon as
"Once we are home, we can rest"
WiktionaryText
Adverb
- one and only one time
- I have only once eaten pizza.
- formerly
- He was once the most handsome man around.
Conjunction
- as soon as
- We'll get a move on once we find the damn car keys!