1. (in Greek philosophy) the exercise of reason.
  2. Psychology. cognition; the functioning of the intellect.


  1. philosophy the exercise of reason, esp in the apprehension of universal formsCompare dianoia
  2. psychol the mental process used in thinking and perceiving; the functioning of the intellectSee also cognition

n.1820, from Greek noesis “intelligence, thought,” from noein “to have mental perception,” from noos “mind, thought.”

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