all saints' day

English Thesaurus

1. a Christian feast day honoring all the saints; first observed in 835 (noun.time)

hypernym	:	holy day of obligation,
definition	:	a day when Catholics must attend Mass and refrain from servile work, and Episcopalians must take Communion (noun.time)

part meronym	:	nov, november,
definition	:	the month following October and preceding December (noun.time)