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The second Sunday in May, observed in the United States as a day honoring mothers.
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.
1. (Ecclesiastical Terms) US and Canadian and Austral and NZ the second Sunday in May, observed as a day in honour of mothers
2. (Ecclesiastical Terms) Also called: Mothering Sunday Brit and South African the fourth Sunday in Lent, when mothers traditionally receive presents from their children
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a day, usu. the second Sunday in May, set aside in honor of mothers.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.