• (America) IPA: /ˈstɪm.jə.ləs/

stimulus (plural stimuluses or stimuli)

  1. Any external phenomenon that has an influence on a system, by triggering or modifying an internal phenomenon.
    an economic stimulus
  2. (physiology) Something external that elicits or influences a physiological or psychological activity or response.
  3. (psychology) Anything effectively impinging upon any of the sensory apparatuses of a living organism, including physical phenomena both internal and external to the body.
  4. Anything that induces a person to take action.
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