terra incognita

noun ter·ra in·cog·ni·ta \ˈter-ə-ˌin-ˌkäg-ˈnē-tə, -in-ˈkäg-nə-tə\

: a place that has not been discovered or that is unknown

plural ter·rae in·cog·ni·tae \ˈter-ˌī-ˌin-ˌkäg-ˈnē-ˌtī, -in-ˈkäg-nə-ˌtī\

Full Definition of TERRA INCOGNITA

: unknown territory : an unexplored country or field of knowledge

See terra incognita defined for English-language learners

Latin

First Known Use: 1611

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