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The definition of stimulus

4 Definitions of: stimulus

    1. noun, something that stimulates or acts as an incentive
    2. noun, any drug, agent, electrical impulse, or other factor able to cause a response in an organism
    3. noun, an object or event that is apprehended by the senses
    4. noun, med. a former name for stimulant
    5. Show me some examples of this word: stimulus
    6. Show me the etymology of the word: stimulus

From Collins