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The Collaborative International Dictionary
Valiantness

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. [1913 Webster] -- Val"iant*ly, adv. -- Val"iant*ness, n.

Wiktionary
valiantness

n. The property of being valiant.