a day, usually the second Sunday in May, set aside in honor of mothers.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for mother's day
US, Canadian, Australian and NZ the second Sunday in May, observed as a day in honour of mothers
Also called: Mothering Sunday British and Southern African the fourth Sunday in Lent, when mothers traditionally receive presents from their children
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012