Inflected forms: pl. terrae in·cog·ni·tae (nkg-nt, -kgn-t) 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.
ETYMOLOGY:
New Latin : Latin terra, land + incognita, feminine of incognitus, unknown.