Third person singular present tense; provides or supports with specific details and relevant evidence.
From circumstantiate + -s (third person singular marker). The root circumstance combines Latin circum- 'around' and stare 'to stand.'
When a report circumstantiates an accusation, it means the report has woven together all the surrounding details and evidence to support it. The word choice emphasizes that proof comes from accumulated context, not from one smoking gun.
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