terra incognita

terra in·cog·ni·ta

I0084700 (ĭn′kŏg-nē′tə, -kŏg′nĭ-tə)n. pl. terrae in·cog·ni·tae (ĭn′kŏg-nē′tē, -kŏg′nĭ-tē′) 1. An unknown land; an unexplored region: "a vast and virtually final terra incognita left to terrestrial explorers" (David F. Salisbury).2. A new or unexplored field of knowledge.

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[New Latin : Latin terra, land + Latin incognita, feminine of incognitus, unknown.]

terra incognita

(ˈtɛrə ɪnˈkɒɡnɪtə) n (Literary & Literary Critical Terms) an unexplored or unknown land, region, or area for study

ter•ra in•cog•ni•ta

(ˈtɛr ə ɪnˈkɒg nɪ tə, ˌɪn kɒgˈni-)
n., pl. ter•rae in•cog•ni•tae (ˈtɛr aɪ ɪnˈkɒg nɪˌtaɪ, ˌɪn kɒgˈni taɪ) an unknown or unexplored land, region, or subject. [1610–20; < Latin: unknown land]

terra incognita

A Latin phrase meaning unknown ground, used to mean an unexplored or unfamiliar territory.

Thesaurus

Noun

1.

terra incognita - an unknown and unexplored region; "they came like angels out the unknown"unknown, unknown regionregion - a large indefinite location on the surface of the Earth; "penguins inhabit the polar regions"