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once
01
for one single time
Examples
I only ate sushi once in Japan.
The bus comes once an hour.
1.1
on even one time, if ever
Examples
You did n't once thank me!
Did she once consider my feelings?
02
at a time in the past
Examples
I once visited that museum when I was a child.
She once lived in New York before moving here.
03
used to indicate one generation of separation in family trees
Examples
My once-removed cousin is my dad's first cousin.
She 's my aunt once removed, my grandmother's sister.
once
01
used to express that something happens at the same time or right after another thing
Examples
I 'll call you once I reach the train station.
Once the concert ends, we'll go backstage to meet the band.
Once
01
a single occurrence
Examples
I'll allow it just this once.
Once is enough, do n't ask again.
