Definitions of tickle:

• noun:   the act of tickling
• noun:   a cutaneous sensation often resulting from light stroking
• verb:   touch (a body part) lightly so as to excite the surface nerves and cause uneasiness, laughter, or spasmodic movements
• verb:   touch or stroke lightly

  Example: "The grass tickled her calves"

• verb:   feel sudden intense sensation or emotion
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #11616)