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mid-15c., "ability to comprehend," from Latin cognitionem (nominative cognitio) "a getting to know, acquaintance, knowledge," noun of action from past participle stem of cognoscere (see cognizance).
cognition cog·ni·tion (kŏg-nĭsh'ən)
The mental faculty of knowing, which includes perceiving, recognizing, conceiving, judging, reasoning, and imagining.