adv.
- on one occasion or for one time only.
▸
[usu. with neg.]
at all; on even one occasion.
- formerly.
- multiplied by one.
conj.
as soon as; when.
Phrase
- all at once
- suddenly.
- all at the same time.
- at once
- immediately.
- simultaneously.
- for once
(or this once)
on this occasion only. - once again
(or more)
one more time. - once and for all
(or once for all)
now and for the last time; finally. - once
(or every once)
in a while
occasionally. - once or twice
a few times. - once upon a time
at some time in the past.
Etymology
ME ones, genitive of one.