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1. An ancient Celtic feast celebrating the end of harvest and the beginning of winter, marked by bonfires and sacrifices and by the propitiation of gods who were believed to become visible and play tricks on their worshipers.
2. The period during which this feast was held, usually the evening of October 31 and the day of November 1.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Samhain(ˈsɑːwɪn; ˈsaʊeɪn; ˈsaʊɪn)
(Other Non-Christian Religions) an ancient Celtic festival held on Nov 1 to mark the beginning of winter and the beginning of a new year. It is also celebrated by modern pagans
[from Irish, from Old Irish samain]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014