- Physiology. the defensive reaction of an organism, as against a pathogenic microorganism.
- Psychology. an unconscious process, as denial, that protects an individual from unacceptable or painful ideas or impulses.
Origin of defense mechanism
First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- Any of a variety of usually unconscious mental processes used to protect oneself from shame, anxiety, loss of self-esteem, conflict, or other unacceptable feelings or thoughts, and including behaviors such as repression, projection, denial, and rationalization.
- immunological mechanism
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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