Merriam-Webster's Collegiate® Dictionary, 11th Edition
THEATRICAL
I. adjective also theatric
Date: 1558
of or relating to the theater or the presentation of plays , marked by pretense or artificiality of emotion,
3. histrionic , marked by extravagant display or exhibitionism, see: dramatic theatricalism noun theatricality noun theatrically adverb
II. noun
Date: circa 1683
1. plural the performance of plays, dramatics , a professional actor, showy or extravagant gestures