tic (t?k)n.1. A repetitive, rapid, sudden muscular movement or vocalization, usually experienced as involuntary or semivoluntary.2. A quirk or habit of behavior or language: common phrases that have become verbal tics.intr.v. ticced, tic·cing, tics To have a tic; produce tics: factors that affect the frequency of ticcing.[French.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.tic (t?k) n (Pathology) spasmodic twitching of a particular group of muscles[C19: from French, of uncertain origin; compare Italian ticche]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014tic (t?k) n. 1. a. a sudden, spasmodic, painless, involuntary muscular contraction, as of the face. b. tic douloureux. 2. a persistent behavioral trait; personal quirk. [1790?1800;