English to English

verb (v)

• touch (a body part) lightly so as to excite the surface nerves and cause uneasiness, laughter, or spasmodic movements(verb.perception)

  Synonym:
  tickle, vellicate
  

  source: wordnet30
• excite pleasurably or erotically(verb.emotion)

  source: wordnet30
• To tickle; as, to titillate the nose with a feather.(verb)

  source: webster1913