/ Dictionary / Index T thicken: Meaning and Definition of Find definitions for: thick•en Pronunciation: (thik'un), [key] — v.t., v.i. to make or become thick or thicker. to make or grow more intense, profound, intricate, or complex: The plot thickens. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thicken (Thesaurus) thick thickener Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language