tickle

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To touch (the body) lightly so as to cause laughter or twitching movements.
• intransitive verb To tease or excite pleasurably; titillate.
• intransitive verb To fill with mirth or pleasure; delight.
• intransitive verb To feel or cause a tingling sensation.
• noun The act of tickling.
• noun A tickling sensation.
• idiom (tickled pink) Very pleased; delighted.

from The Century Dictionary.

• Easily moved; unsteady; unstable; inconstant.
• noun A light teasing touch in some sensitive part; a gentle tickling act or action.
• noun A narrow passage or entrance to a harbor.
• To tease with repeated light touches in some sensitive part, so as to excite the nerves, thereby producing a peculiar thrilling sensation which commonly results in spasmodic laughter, or, if too long continued, in a convulsion; titillate.
• To touch, affect, or excite agreeably; gratify; please or amuse by gentle appeals to one's imagination, sense of humor, vanity, or the like.
• To take, move, or produce by touching lightly.
• To feel titillation: as, his foot tickled.
• To tingle pleasantly; thrill with gratification or amusement.
• To have an impatient or uneasy desire to do or to get something; itch; tingle.
• To produce the sensation of titillation, or the slight nervous excitement of a light touch on some sensitive part.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb To feel titillation.
• intransitive verb To excite the sensation of titillation.
• adjective obsolete Ticklish; easily tickled.
• adjective obsolete Liable to change; uncertain; inconstant.
• adjective obsolete Wavering, or liable to waver and fall at the slightest touch; unstable; easily overthrown.
• transitive verb To touch lightly, so as to produce a peculiar thrilling sensation, which commonly causes laughter, and a kind of spasm which become dengerous if too long protracted.
• transitive verb To please; to gratify; to make joyous.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of tickling.
• noun A feeling resembling the result of tickling.
• noun Newfoundland A narrow strait.
• verb transitive To touch repeatedly or stroke delicately in a manner which causes the recipient to feel a usually pleasant sensation of tingling or titillation.
• verb intransitive, of a body part To feel as if the body part in question is being tickled.
• verb transitive To appeal to someone's taste, curiosity etc.
• verb transitive To cause delight or amusement.
• adjective Changeable, capricious; insecure.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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