In a manner that confirms, supports, or provides corroborating evidence; in a way that strengthens or validates something.
From 'corroborative' plus '-ly' adverbial suffix, creating an adverb describing how something is done with corroborating force or effect.
The existence of this adverb shows language's flexibility—while rarely used, 'corroboratively' allows speakers to describe the manner of confirmation itself, making it valuable in specialized academic or legal contexts.
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