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stimulus noun

  /ˈstɪm.jə.ləs/
  • An external phenomenon that has an influence on a system, by triggering or modifying an internal phenomenon; for example, a spur or incentive that drives a person to take action or change behaviour.
  • (physiology, psychology, medicine) Something external that elicits or influences a physiological or psychological activity or response, or that affects any of the sensory apparatuses.
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