Origin: 1275–1325; Middle English espousaille < Middle French, Old French espousailles < Latin spōnsālia (noun use of neuter plural of spōnsālis), equivalent to spōns(us) spouse + -ālia-al2
late 14c., from O.Fr. espousailles (pl.) "act of betrothal," from L. sponsalia, neut. pl. of sponsalis "of a betrothal," from sponsa "spouse." For the -e- see especially.