The Collaborative International Dictionary of English v.0.48:

Deputation \Dep`u*ta"tion\, n. [Cf. F. d['e]putation. See
   Depute.]
   1. The act of deputing, or of appointing or commissioning a
      deputy or representative; office of a deputy or delegate;
      vicegerency.
      [1913 Webster]

            The authority of conscience stands founded upon its
            vicegerency and deputation under God. --South.
      [1913 Webster]

   2. The person or persons deputed or commissioned by another
      person, party, or public body to act in his or its behalf;
      delegation; as, the general sent a deputation to the enemy
      to propose a truce.
      [1913 Webster]

   By deputation, or In deputation, by delegated authority;
      as substitute; through the medium of a deputy. [Obs.]
      [1913 Webster]

            Say to great C[ae]sar this: In deputation
            I kiss his conquering hand.           --Shak.
      [1913 Webster]