Source : Webster's Revised Unabridged Dictionary (1913)

Guerdon \Guer"don\, n. [OF. guerdon, guerredon, LL. widerdonum
   (influenced by L. donum gift, cf. {Donation} ), fr. OHG.
   widarl[=o]n; widar again, against (G. wider wieder) + l[=o]n
   reward, G. lohn, akin to AS. le['a]n Goth. laun. See
   {Withers}.]
   A reward; requital; recompense; -- used in both a good and a
   bad sense. --Macaulay.

         So young as to regard men's frown or smile As loss or
         guerdon of a glorious lot.               --Byron.

         He shall, by thy revenging hand, at once receive the
         just guerdon of all his former villainies. --Knolles.

Guerdon \Guer"don\, v. t. [OF. guerdonner, guerredonner. See
   {Guerdon}, n.]
   To give guerdon to; to reward; to be a recompense for. [R.]

         Him we gave a costly bribe To guerdon silence.
                                                  --Tennyson.

Source : WordNet®

guerdon
     n : a reward or payment