Etymology
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parvenu (n.)

"upstart," 1802, from French parvenu, "said of an obscure person who has made a great fortune" (Littré); noun use of past participle of parvenir "to arrive" (12c.), from Latin pervenire "to come up, arrive, attain," from per- "through" (from PIE root *per- (1) "forward," hence "through") + venire "to come," from a suffixed form of PIE root *gwa- "to go, come." One newly arisen to notice, especially by an accident of fortune and beyond his birth or apparent deserts, but who is intent to persuade other people that he is entitled to it. As an adjective from 1828.

updated on February 10, 2020

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Definitions of parvenu from WordNet
1
parvenu (adj.)
characteristic of someone who has risen economically or socially but lacks the social skills appropriate for this new position;
Synonyms: nouveau-riche / parvenue / upstart
parvenu (adj.)
of or characteristic of a parvenu;
Synonyms: parvenue
2
parvenu (n.)
a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class;
Synonyms: upstart / nouveau-riche / arriviste
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.