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Stimulus

/ˈstɪmjələs/

A thing or event that causes a reaction or response in a person or organism.

Synonyms:

Often, thoughts are triggered due to external stimuli.

A good book can serve as a stimulus for creativity.

The aroma of the bakery acted as a pleasant stimulus.

Mid 17th century: originally denoting a goad for urging on animals, from Latin stimulus meaning "goad, spur".

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