Terrene is an adjective that means earthly or mundane and also a noun that means earth or terrain.
Terra (TEAR uh) is the Latin word for earth. When used as a noun, the word is basically the same as terrain, but with a different spelling. As an adjective it is a synonym of worldly, as in: As a younger person, I focused mostly on terrene matters. But as I’ve gotten older, I realized that there are spiritual matters that are far more important.