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type A behavior

n.
  1. A behavior pattern characterized by tenseness, impatience, and aggressiveness, often resulting in stress-related symptoms such as insomnia and indigestion and possibly increasing the risk of heart disease.type A personality
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.