terra /ˈtɛɹə/noun 4forms 3phrases 1 noun4 •(literary) Earth, soil, land, or ground as a physical surface. •A continent or large landmass, especially on another planet or moon; e.g. Arabia Terra or Aphrodite Terra. •A lunar highland or mountainous region with relatively high albedo; e.g. Terra Nivium. •(no longer used) The material world as opposed to the heavens. formsterrae · terrae · terras Phrases with terra terra firmaFamiliar territory (in a figurative sense); real-world concerns.