LATIN DICTIONARYLexicon Latīnum
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“prosper” in Latin

The English word prosper itself goes back to Latin prosperus, through prosperō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

prosper
Intransitively, uti prospera fortuna (to be prosperous): bene or prospere succedere; successum, prosperos successus habere (to succeed well).
Transitively, fortunare aliquem or aliquid (to give good fortune to): prosperare aliquid (to cause to succeed: ☞ secundare is poetic): prosperare alicui aliquid (to cause one to succeed in anything): augere aliquem aliqua re (to furnish copiously or abundantly with anything).
Prosper
Prosper, -eri (m.)

Quick answer

What is the Latin word for prosper?
The usual Latin words for “prosper” are bonus, succēdō, prosper. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.