noun, feminine/ply.paʁ/
main part, majority; most of
“Il a mangé la plupart du gâteau” — He ate most of the cake.
From Middle French, from Old French pluspart (“the greater/greatest part of something”). By surface analysis, plus + part. Probably calqued from a Germanic phrase related to Old English māra dǣl (“majority”, literally “the greater part”), Dutch meerdeel, German Mehrteil.