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/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”. ( 2. In physiology, something external that influences an activity. ( 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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