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terra incognita

(ter′ə in kägni tə)

  1. an unknown land; unexplored territory
  2. an unknown or unexplored field of knowledge

Origin: L

See terra incognita in American Heritage Dictionary 4

noun pl. terrae in·cog·ni·tae (ĭnˌkŏg-nēˈtē, -kŏgˈnĭ-tēˌ)
  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.

Origin:

Origin: New Latin

Origin: : Latin terra, land

Origin: + incognita

Origin: , feminine of incognitus, unknown

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