Described or supported with specific details and evidence; proven through detailed circumstances and facts.
Past participle of circumstantiate. The -ed ending shows completion of the action of providing circumstances. It functions as both past tense verb form and adjective.
A circumstantiated claim is one backed up by all the surrounding details and facts—it's what you get when someone says 'here's not just my opinion, but here's all the evidence surrounding it.' It's stronger than 'claimed' but weaker than 'proven.'
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