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Definition of stimulus:

  1. In med., that which produces a sudden but transitory increase of vital action; anything that excites to action; a stimulant; in bot., applied to stinging hairs with an irritating secretion at the base.

Synonyms:

stimulant drug, stimulator, fillip, nourishment, arousal, push, prompt, yeast, input signal, foreplay, input, incitation, spur, stimulation, comment, momentum, persuasion, remark, goad, stimulant, trigger, excitant, boost, encouragement.

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