Source : Webster's Revised Unabridged Dictionary (1913)

Parvenu \Par"ve*nu`\, n. [F., prop. p. p. of parvenir to attain
   to, to succeed, to rise to high station, L. pervenire to come
   to; per through + venire to come. See {Par}, prep., and
   {Come}.]
   An upstart; a man newly risen into notice.

Source : WordNet®

parvenu
     adj 1: characteristic of someone who has risen economically or
            socially but lacks the social skills appropriate for
            this new position [syn: {nouveau-riche}, {parvenue}, {upstart(a)}]
     2: of or characteristic of a parvenu [syn: {parvenue}]

parvenu
     n : a person who has suddenly risen to a higher economic status
         but has not gained social acceptance of others in that
         class [syn: {upstart}, {nouveau-riche}, {arriviste}]