Source : Webster's Revised Unabridged Dictionary (1913)

Serjeant \Ser"jeant\, Serjeantcy \Ser"jeant*cy\, etc.
   See {Sergeant}, {Sergeantcy}, etc.

   {Serjeant-at-arms}. See {Sergeant-at-arms}, under {Sergeant}.

Source : WordNet®

serjeant-at-arms
     n : an officer (as of a legislature or court) who maintains
         order and executes commands [syn: {sergeant at arms}]