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Stimulus

/ˈstɪmjʊləs/ Noun, pl. stimuli 1. A thing or event that evokes a specific functional reaction in an organ or tissue: “areas of the brain which respond to auditory stimuli”. (wikipedia.com) 2. In physiology, something external that influences an activity. (wikipedia.com) 3. Any drug, agent, electrical impulse, or other factor able to cause a response in an organism. (Collins English Dictionary — Complete and Unabridged)   Syn: impetus, impulse, incitement, influence Word origin: from Latin stimulus (goad,...

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