Source : Webster's Revised Unabridged Dictionary (1913)

Declarer \De*clar"er\, n.
   One who makes known or proclaims; that which exhibits.
   --Udall.

Source : WordNet®

declarer
     n 1: the bridge player in contract bridge who wins the bidding
          and can declare which suit is to be trumps [syn: {contractor}]
     2: someone who claims to speak the truth; "a bold asserter"; "a
        declarer of his intentions"; "affirmers of traditional
        doctrine"; "an asseverator of strong convictions"; "an
        avower of his own great intelligence" [syn: {asserter}, {affirmer},
         {asseverator}, {avower}]