WordReference Random House Learner's Dictionary of American English © 2014
Hal•low•een or Hal•low•e'en /ˌhæləˈwin, ˌhɑl-/USA pronunciation n. [uncountable;
Religionthe evening of Oct. 31;
the eve of All Saints' Day, observed esp. by children, who dress in costume and play trick or treat.

Collins Concise English Dictionary © HarperCollins Publishers::

Halloween, Hallowe'en /ˌhæləʊˈiːn/ n
  1. the eve of All Saints' Day celebrated on Oct 31 by masquerading; Allhallows Eve
Etymology: 18th Century: see Allhallows, even²

'Halloween' also found in these entries:

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