Word Origin & History
prosper
c.1460, from O.Fr. prosperer (14c.), from L. prosperare "cause to succeed, render happy," from prosperus "favorable, fortunate, prosperous," perhaps lit. "agreeable to one's wishes," from Old L. pro spere "according to expectation," from pro "for" + abl. of spes "hope," from PIE base *spei- "to flourish, succeed." Prosperous is first recorded 1445, originally "tending to bring success;" in the sense of "flourishing" it is first recorded 1472.