society > faith > worship > liturgical year > feast, festival > specific Christian festivals > Halloween (31 October) > [noun] (5)
= All Hallows' Eve n. at compounds 1.
the day before All Saints' Day; = Halloween, n.
= All Hallows' Eve n. at All-Hallows, n. compounds 1.
The eve of All Hallows' or All Saints'; the last night of October. Also attributive.