early 15c., "pleasing excitement," from Latin titillationem (nominative titillatio) "a tickling," noun of action from past participle stem of titillare "to tickle," imitative of giggling.
early 15c., "pleasing excitement," from Latin titillationem (nominative titillatio) "a tickling," noun of action from past participle stem of titillare "to tickle," imitative of giggling.