Origin: 1350–1400; Middle English vaunten < Middle French vanter to boast < Late Latin vānitāre, frequentative of *vānāre, derivative of Latin vānusvain.See vanity
mid-14c., from M.Fr. vanter "to praise, speak highly of," from L.L. vanitare "to boast," frequentative of L. vanare "to utter empty words," from vanus "idle, empty" (see vain).