Stimulus is a change in the atmosphere to which an organism reacts. For instance, human beings detect a stimulus by the use of the sensory organs. Stimulus may also refer to any exciting information or event.
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what does stimulus mean
NOUN [PLURAL STIM·U·LI]
something that incites to action or exertion or quickens action, feeling, thought, etc.: The approval of others is a potent stimulus.
Physiology, Medicine/Medical something that excites an organism or part to functional activity.