In a manner that serves to complete or perfect; in a way that achieves final or ultimate completion.
From consummative + -ly (Old English suffix forming adverbs). The -ly suffix converts adjectives into adverbs describing how actions are performed.
English makes adverbs by slapping -ly onto adjectives, which is why 'consummative' becomes 'consummatively.' This stacking of suffixes creates increasingly formal, technical-sounding words!
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