The Collaborative International Dictionary of English v.0.48:

Mundane \Mun"dane\, a. [L. mundanus, fr. mundus the world, an
   implement, toilet adornments, or dress; cf. mundus, a.,
   clean, neat, Skr. ma[.n][dsdot] to adorn, dress,
   ma[.n][dsdot]a adornment. Cf. Monde, Mound in heraldry.]
   1. Of or pertaining to the world; worldly, as contrasted with
      heavenly; earthly; terrestrial; as, the mundane sphere;
      mundane concerns. -- Mun"dane*ly, adv.
      [1913 Webster]

            The defilement of mundane passions.   --I. Taylor.
      [1913 Webster]

   2. Commonplace; ordinary; banal.
      [PJC]

WordNet (r) 3.0 (2006):

mundanely
    adv 1: in a worldly manner; "terrestrially changeable" [syn:
           mundanely, terrestrially]
    2: in a mundane manner; "the young man spoke so mundanely of
       university life"