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English definition of “stimulus”

stimulus

noun [C/U]  /ˈstɪm·jə·ləs/ (plural stimuli  /ˈstɪm·jəˌlɑɪ, -ˌli/) us  
something that causes growth, activity, or reaction: [C] Scientists are studying the cell’s response to stimuli. [U] The aid package would provide very little fiscal stimulus.
(Definition of stimulus from the Cambridge Academic Content Dictionary © Cambridge University Press)
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