/ Dictionary / Index T terrain: Meaning and Definition of Find definitions for: ter•rain Pronunciation: (tu-rān'), [key] — n. a tract of land, esp. as considered with reference to its natural features, military advantages, etc. terrane. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: terrain (Thesaurus) terraform terra incognita Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language