Definitionen
1.NounA geologic and geographic region of a celestial body which is a highland analogous to a continent or large landmass.
2.NounEarth, soil, land, or ground as a physical surface.
3.NounThe material world as opposed to the heavens.
4.NounA continent or large landmass, especially on another planet or moon; e.g. Arabia Terra or Aphrodite Terra.
5.NounA lunar highland or mountainous region with relatively high albedo; e.g. Terra Nivium.