Definition of stimulus noun from the Oxford Advanced American Dictionary

     

    stimulus

     noun
    noun
    NAmE//ˈstɪmyələs//
     
    (pl. stimuli
    NAmE//ˈstɪmyəˌlaɪ//
     
    )
    stimulus (to/for something)stimulus (to do something)
     
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  1. 1[usually singular] something that helps someone or something to develop better or more quickly Books provide children with ideas and a stimulus for play. The new tax laws should act as a stimulus to exports.
  2. 2something that produces a reaction in a human, an animal, or a plant sensory/verbal/visual stimuli The animals were conditioned to respond to auditory stimuli (= sounds).
See the Oxford Advanced Learner's Dictionary entry: stimulus