WordReference Random House Learner's Dictionary of American English © 2017
Hal•low•een or  Hal•low•e'en /ˌhæləˈwin, ˌhɑl-/USA pronunciation   n. [uncountablecountable]
  1. Religionthe evening of Oct. 31;
    the eve of All Saints' Day, observed esp. by children, who dress in costume and play trick or treat.

WordReference Random House Unabridged Dictionary of American English © 2017
Hal•low•een  (hal′ə wēn, -ō ēn, hol′-),USA pronunciation n. 
  1. Religionthe evening of October 31;
    the eve of All Saints' Day;
    Allhallows Eve: observed esp. by children in costumes who solicit treats, often by threatening minor pranks.
Also,  Hal′low•e'en. 
  • (All)hallow(s) + e(v)en2 1550–60

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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