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anxiety reaction

n.
  1. A psychological state or experience involving the apprehension of danger, accompanied by a feeling of dread and such physical symptoms as restlessness and rapid heartbeat, occurring in the absence of any clearly identifiable fear stimulus.anxiety state
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.