/ Dictionary / Index T terra incognita: Meaning and Definition of Find definitions for: ter•ra in•cog•ni•ta Pronunciation: (ter'u in-kog'ni-tu, in"kog-nē'- Lat. ter'rä in-kôg'ni-tä). [key] an unknown or unexplored land, region, or subject. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. terrain terramara Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language