Kinktionary
More like guidelines and a lot less like definitions.
Nipple play
Nipple play focuses on the stimulation of the nipple or the area around the nipples. This can be done with toys like nipple clamps or with the hands or mouth.
Some people find that stimulation to their nipples arouses them more or that it can increase or heighten their sexual experience. Some people can even orgasm through nipple stimulation, though this is very specific and varies from person to person. Generally, most people enjoy nipple play as part of increasing the sensuality between people or complementing other sexual or kinky activities.