- The definition of a stressor is something that causes tension or anxiety.
An example of a stressor is a huge project due in a short amount of time.
stressor definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
any stimulus producing mental or physical stress in an organism
stressor definition by American Heritage Dictionary
An agent, condition, or other stimulus that causes stress to an organism.