Source : Webster's Revised Unabridged Dictionary (1913)

Mien \Mien\, n. [F. mine; perh. from sane source as mener to
   lead; cf. E. demean, menace, mine, n.]
   Aspect; air; manner; demeanor; carriage; bearing.

         Vice is a monster of so frightful mien, As, to be
         hated, needs but to be seen.             --Pope.

Source : WordNet®

mien
     n : dignified manner or conduct [syn: {bearing}, {comportment},
         {presence}]