stimulation-n; 3 Senses

Sense Number 1: the physiological activation of an organism or organ

Commentary: STIMULATION[+event][+physiological][+activation][+of_organism]

This exercise is great for the stimulation of your cardiovascular system.
The experiment involves the stimulation of different nerves with mild electric shocks.

WordNet 3.0 Sense Numbers: 1, 3

Sense Number 2: engaging, interesting activity

Commentary: STIMULATION[+activity][+interesting][+engaging]

The brightest students are getting almost no stimulation in these classes.
It was a great stimulation to Mary to get out of the office for two weeks and travel to China.
Daily walks provide your pet with both exercise and mental stimulation.

WordNet 3.0 Sense Numbers: 2

Sense Number 3: sexual foreplay

Commentary: STIMULATION[+event][+physiological][+activation][+of_organism][+foreplay][+sexual]
NOTE: a narrow, specialized usage of Sense 1

That shop sells aids for sexual stimulation.
The case centers on whether the sexual stimulation occurred between consenting adults.

WordNet 3.0 Sense Numbers: 4