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terra incognita

[ter-uh in-kog-ni-tuh, in-kog-nee-; Latin ter-rah in-kawg-ni-tah] /ˈtɛr ə ɪnˈkɒg nɪ tə, ˌɪn kɒgˈni-; Latin ˈtɛr rɑ ɪnˈkɔg nɪ tɑ/
noun
1.
an unknown or unexplored land, region, or subject.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for terra-incognita

terra incognita

/ˈtɛrə ɪnˈkɒɡnɪtə/
noun
1.
an unexplored or unknown land, region, or area for study
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for terra-incognita

terra incognita

n.

"unknown or unexplored region," 1610s, Latin, literally "unknown land," from terra (see terrain) + fem. of incognito.

Online Etymology Dictionary, © 2010 Douglas Harper
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