To describe or support something with specific details, facts, and evidence; to prove through relevant circumstances.
From circumstance + -ate verb suffix. The formation suggests 'to make circumstantial' or 'to surround with details.' It's a formal, academic verb rarely used in everyday speech.
When someone asks you to circumstantiate your claim, they're not asking if it's true—they're asking if you can back it up with specific, detailed evidence. It's the verb form of 'provide the circumstances that prove this.'
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