noun
the occurrence and development of events by chance in a happy or beneficial way
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The discovery of penicillin by Alexander Fleming was a result of serendipity.
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Running into my old friend at the grocery store was pure serendipity.
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Finding a $20 bill on the sidewalk was such a serendipitous moment!
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Sometimes, the best moments in life come from serendipity, like finding love when you least expect it.