The Collaborative International Dictionary of English v.0.48:

Emolument \E*mol"u*ment\, n. [L. emolumentum, lit., a working
   out, fr. emoliri to move out, work out; e out + moliri to set
   in motion, exert one's self, fr. moles a huge, heavy mass:
   cf. F. ['e]molument. See Mole a mound.]
   The profit arising from office, employment, or labor; gain;
   compensation; advantage; perquisites, fees, or salary.
   [1913 Webster]

         A long . . . enjoyment of the emoluments of office.
                                                  --Bancroft.
   [1913 Webster]

WordNet (r) 3.0 (2006):

emolument
    n 1: compensation received by virtue of holding an office or
         having employment (usually in the form of wages or fees);
         "a clause in the U.S. constitution prevents sitting
         legislators from receiving emoluments from their own votes"