Stimulation is the irritating action of various agents (stimuli) on muscles, nerves, or a sensory end organ, by which activity is evoked; especially, the nervous impulse produced by various agents on nerves, or a sensory end organ, by which the part connected with the nerve is thrown into a state of activity.

The word is also often used metaphorically. For example, an interesting or fun activity can be described as "stimulating," regardless of its physical effects on nerves.

See also

• Irritation