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once
01
for one single time
Examples
I only ate sushi once in Japan.
1.1
on even one time, if ever
Examples
You did n't once thank me!
02
at a time in the past
Examples
I once visited that museum when I was a child.
03
used to indicate one generation of separation in family trees
Examples
My once-removed cousin is my dad's first cousin.
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
01
a single occurrence
Examples
I'll allow it just this once.
