■ adverb
1》 on one occasion or for one time only.
↘[usu. with negative ] at all; on even one occasion.
2》 formerly.
3》 multiplied by one.
■ conjunction as soon as; when.
Phrases
all at ~
1》 suddenly.
2》 all at the same time.
at ~
1》 immediately.
2》 simultaneously.
for ~ (or this ~ ) on this occasion only.
~ again (or more ) one more time.
~ and for all (or ~ for all ) now and for the last time; finally.
~ (or every ~ ) in a while occasionally.
~ or twice a few times.
~ upon a time at some time in the past.
Origin
ME ones , genitive of one .