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.
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         Charity vaunteth not itself, is not puffed up. --1 Cor.
                                                  xiii. 4.
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         My vanquisher, spoiled of his vaunted spoil. --Milton.
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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.
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The Collaborative International Dictionary of English v.0.48:

Vaunt \Vaunt\, n. [F. avant before, fore. See Avant,
   Vanguard.]
   The first part. [Obs.] --Shak.
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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.
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         And what so else his person most may vaunt. --Spenser.
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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.
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         Pride, which prompts a man to vaunt and overvalue what
         he is, does incline him to disvalue what he has. --Gov.
                                                  of Tongue.
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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]

Moby Thesaurus II by Grady Ward, 1.0:

81 Moby Thesaurus words for "vaunt":
   advertise, air, blazon, blazon forth, blow, bluster, boast,
   boastfulness, boasting, bombast, brag, braggadocio, braggartism,
   bragging, brandish, bravado, bravura, brilliancy,
   cock-a-doodle-doo, conceit, crow, dangle, daring, dash,
   demonstrate, demonstration, display, dramatics, draw the longbow,
   eclat, emblazon, etalage, exhibit, exhibition, exhibitionism,
   false front, fanfaronade, figure, flair, flash, flaunt, flaunting,
   flourish, gasconade, gasconism, heroics, histrionics, hold up,
   jactation, jactitation, manifest, manifestation, mouth, pageant,
   pageantry, parade, prate, puff, put forth, put forward,
   rodomontade, sham, show, show off, showing-off, side,
   speak for Buncombe, spectacle, splash, splurge, sport, staginess,
   swagger, theatrics, trumpet, trumpet forth, vanity, vapor,
   vauntery, vaunting, wave