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once

 
 
pronunciation:
wuhns
parts of speech:
adverb, conjunction
phrases:
at once
part of speech: adverb
definition 1: at one time in the past.
She was once a teacher, but that was a long time ago.
definition 2: only one time.
Tim gets his hair cut once a month.
 
part of speech: conjunction
definition: if something ever happens, or anytime that something happens; when.
Once you feed that cat, she will come back every day.Once someone explains something to me, I never forget.
phrase: at once