In a way that can be known or perceived; in a manner that is capable of being recognized.
From cognizable (able to be known) plus the adverbial suffix -ly. This is the American English spelling of 'cognisably.'
Like its British cousin, this adverb is almost never used—when lawyers need to say something is perceivable, they'd use 'noticeably' or 'perceptibly' instead of reaching for 'cognizably'!
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