vi to feel titillation.
2. tickle ·adj ticklish; easily tickled.
3. tickle ·adj liable to change; uncertain; inconstant.
4. tickle ·vi to excite the sensation of titillation.
5. tickle ·vt to please; to gratify; to make joyous.
6. tickle ·adj wavering, or liable to waver and fall at the slightest touch; unstable; easily overthrown.
7. tickle ·vt 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.