A person who possesses no metaphysical talents or qualities. Alternately, a person who is perceived to lack a certain form of enlightenment, intelligence, or talent. Generally used by the persons who possess said gifts or qualities, and is sometimes but not necessarily used in a condescending or elitist manner. Was used in the sci-fi series "Babylon 5" by the telepaths to refer to non-telepaths. Also used in some psychic, spiritual, or metaphysical circles to refer to those who have no such talents.
The mundanes have no concept of magic, they're completely blind to it, our ways are strange to them.