Source : Webster's Revised Unabridged Dictionary (1913)

Valiant \Val"iant\, a. [OE. valiant, F. vaillant, OF. vaillant,
   valant, originally p. pr. of OF. & F. valoir to be worth, L.
   valere to be strong. See {Wield}, and cf. {Avail},
   {Convalesce}, {Equivalent}, {Prevail}, {Valid}.]
   1. Vigorous in body; strong; powerful; as, a valiant fencer.
      [Obs.] --Walton.

   2. Intrepid in danger; courageous; brave.

            A valiant and most expert gentleman.  --Shak.

            And Saul said to David . . . be thou valiant for me,
            and fight the Lord's battles.         --1 Sam.
                                                  xviii. 17.

   3. Performed with valor or bravery; heroic. ``Thou bearest
      the highest name for valiant acts.'' --Milton.

            [The saints] have made such valiant confessions.
                                                  --J. H.
                                                  Newman.
      -- {Val"iant*ly}, adv. -- {Val"iant*ness}, {n}.

Source : WordNet®

valiant
     adj : having or showing valor; "a valiant attempt to prevent the
           hijack"; "a valiant soldier" [syn: {valorous}]