"evening party," 1793, a French word in English, from French soirée, from soir "evening," Old French soir "evening, night" (10c.), from Latin sero (adv.) "late, at a late hour," from serum "late hour," neuter of serus "late," from PIE *se-ro-, suffixed form of root *se- (2) "long, late" (source also of Sanskrit sayam "in the evening," Lithuanian sietuva "deep place in a river," Old English sið "after," German seit "since," Gothic seiþus "late," Middle Irish sith, Middle Breton hir "long").
The French fem, suffix -ée, from Latin -ata, was joined to nouns in French to make nouns expressing the quantity contained in the original noun, and thus also relations of times (journée, matinée, année) or objects produced.
updated on March 02, 2023