stimulus

/ˈstɪm.jə.ləs/

noun

Any external phenomenon that has an influence on a system, by triggering or modifying an internal phenomenon.
"an economic stimulus"
Something external that elicits or influences a physiological or psychological activity or response.
Anything effectively impinging upon any of the sensory apparatuses of a living organism, including physical phenomena both internal and external to the body.

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