LATIN DICTIONARYLexicon Latīnum
suffixfirst/second-declension suffix

-plus

-plus (feminine -pla, neuter -plum)
Classical[pɫʊs]Ecclesiastical[plus]

Meaning

  1. morphemesuffix-times, -fold, suffix used to form proportional numerals

Origins

From Proto-Italic *-plos, cognate with Ancient Greek -πλόος (-plóos) or -πλός (-plós) (as in διπλός (diplós)), the second element of Old Irish díabul (“double”) and possibly Proto-Germanic *twīflaz (“doubt”). From an unclear root of the form *pl(H), possibly from Proto-Indo-European *pleh₁- (“to fill”) or Proto-Indo-European *pelh₂- (“to approach”) or Proto-Indo-European *pel- (“to fold”), source of Proto-Germanic *-falþaz (“-fold”). Compare also -plex.

Quick answers

What does -plus mean in Latin?
-plus, a suffix, means “-times, -fold, suffix used to form proportional numerals”.
How do you pronounce -plus?
In classical Latin, [pɫʊs]; in ecclesiastical (church) Latin, [plus].