plural stimuli
ˈstɪmjəˌlaɪ 
1
: something that causes something else to happen, develop, or become more active
The pay raise was a stimulus for production.
an economic stimulus plan
2
: something that causes a change or a reaction
Heat and light are physical stimuli.
The dog responded to the stimulus of the ringing bell.
Cite this Entry
“Stimulus.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/stimulus. Accessed 19 Jun. 2026.
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