n. (used with a sing. verb)
- The branch of psychology that studies pleasant and unpleasant sensations and states of mind.
- Philosophy. The branch of ethics that deals with the relation of pleasure to duty.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
