n.
Variant: also Hal · low · e'en
Pronunciation: ˌ ha-l ə - ' w ē n, ˌ hä-
Function: noun
Etymology: short for All Hallow Even (All Saints' Eve)
Date: circa 1700
: October 31 observed especially with dressing up in disguise, trick-or-treating, and displaying jack-o'-lanterns during the evening