Stimulation

Webster's Dictionary of the English Language

·noun The act of stimulating, or the state of being stimulated.

II. Stimulation ·noun 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; irritation.