In a manner that confirms, verifies, or provides confirmation; so as to establish or make certain.
From 'confirmative' (adjective) plus the adverb suffix '-ly.' The suffix '-ly' comes from Old English '-lice' (like, in the manner of), transforming adjectives into adverbs.
Adding '-ly' to '-ative' adjectives creates adverbs that are quite formal and rare in everyday speech—'confirmatively' is the kind of word you'd encounter in legal documents rather than casual conversation, showing how word formations cluster in specialized registers.
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