stimulus
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noun (plural stimuli |-ˌlī| )
a thing or event that evokes a specific functional reaction in an organ or tissue:
〘生理･心〙 刺激;
e.g. areas of the brain which respond to auditory stimuli.
a thing that rouses activity or energy in someone or something; a spur or incentive:
〖通例単数形で〗 «…への/…する» 刺激(物); 励み(になるもの) «to, for/to do»
e.g. if the tax were abolished, it would act as a stimulus to exports.
an interesting and exciting quality:
e.g. she loved the stimulus of the job.
ORIGIN
late 17th century: from Latin, ‘goad, spur, incentive’.