Coincidence
/koʊˈɪnsɪdəns/
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Definition
(noun) Of objects, the property of being coincident; occurring at the same time or place.
Sentence Examples
It was sheer coincidence that Mary and I were on the same train.
I think it is a mere coincidence.
CEFR Practice Quiz
It was a strange ____ that we both wore the same green shirt ton.