noun
a detail or circumstance that is not essential but is helpful in understanding a situation
adjective
describing or pertaining to circumstances or details that are not essential but are helpful in understanding a situation
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The evidence presented in court was purely circumstantial and did not definitively prove the defendant's guilt.
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The police have a few circumstantial clues, but nothing concrete yet.
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I heard a bunch of circumstantial gossip about what really happened at the party.
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His success was not due to luck, but rather a series of circumstantial events that led him to where he is now.