/ Dictionary / Index A arc tangent: Meaning and Definition of Find definitions for: arc' tan'gent Pronunciation: [key] — Trig. Trig. the angle, measured in radians, that has a tangent equal to a given number. Abbr.: arc tan; Symbol: tan&hasp; Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arctangent (Thesaurus) arc tan arctic Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language