noun (used with a singular verb)

  1. the branch of psychology that deals with pleasurable and unpleasurable states of consciousness.

noun (functioning as singular)

  1. the branch of psychology concerned with the study of pleasant and unpleasant sensations
  2. (in philosophy) the study of pleasure, esp in its relation to duty


  1. The branch of psychology that studies pleasant and unpleasant sensations and states of mind.

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