The Collaborative International Dictionary of English v.0.48:

Vaunt \Vaunt\, v. t.
   To boast of; to make a vain display of; to display with
   ostentation. In the latter sense, the term usually used is
   flaunt.
   [1913 Webster]

         Charity vaunteth not itself, is not puffed up. --1 Cor.
                                                  xiii. 4.
   [1913 Webster]

         My vanquisher, spoiled of his vaunted spoil. --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vaunt \Vaunt\, n.
   A vain display of what one is, or has, or has done;
   ostentation from vanity; a boast; a brag.
   [1913 Webster]

         The spirits beneath, whom I seduced
         With other promises and other vaunts.    --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vaunt \Vaunt\, n. [F. avant before, fore. See Avant,
   Vanguard.]
   The first part. [Obs.] --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vaunt \Vaunt\, v. t. [See Avant, Advance.]
   To put forward; to display. [Obs.] "Vaunted spear."
   --Spenser.
   [1913 Webster]

         And what so else his person most may vaunt. --Spenser.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Vaunt \Vaunt\ (v[aum]nt or v[add]nt; 277), v. i. [imp. & p. p.
   Vaunted; p. pr. & vb. n. Vaunting.] [F. vanter, LL.
   vanitare, fr. L. vanus vain. See Vain.]
   To boast; to make a vain display of one's own worth,
   attainments, decorations, or the like; to talk
   ostentatiously; to brag.
   [1913 Webster]

         Pride, which prompts a man to vaunt and overvalue what
         he is, does incline him to disvalue what he has. --Gov.
                                                  of Tongue.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vaunt
    n 1: extravagant self-praise
    v 1: show off [syn: boast, tout, swash, shoot a line,
         brag, gas, blow, bluster, vaunt, gasconade]