What is an extraterrestrial life?

Answer 1

Terrestrial means "of Terra," which is the Latin name of Earth. So extra-terrestrial would be "outside of Earth." It means living things that are not from our planet.

Answer 2

Beyond this land/this world.

Beyond this land/this world also extends into multiple dimensions, into things that are not normally perceivable by the trained, educated "terrestrialized" human. From that perspective, one could be standing firmly rooted on the surface of Planet Earth and enjoying a communication with a being that expresses primarily on the sixth dimension, a being whose sole purpose in existing is to engineer the transfer of conscious thought into physical reality by "holding the space" for the manifestation of a conscious matrix of nodal points on which the elements of physicality are "written." From a sixth-dimensional perspective, the normal human space-time matrix is enfolded in and permeated by the energies, essences and wavicles of the interstitial dimensions. As the mathematics of Unity Theory require thirteen dimensions for a unification between String Theory and Unified Field Theory, it's possible that that sixth dimensional entity is aware of the possibilities and probabilities of existence and higher aggregates of consciousness in those higher dimensions yet, all the way up to a proposed state of Universal Consciousness at the tenth dimensional level (the thirteenth dimension being reputed to be the residence of All That Is and Isn't).