'Mother's Day' definitions:
Definition of 'Mother's Day'
(from WordNet)
noun
Second Sunday in May
Definition of 'Mother's Day'
From: GCIDE
- Mother's Day \Moth"er's Day\ A day appointed for the honor and uplift of motherhood by the loving remembrance of each person of his mother through the performance of some act of kindness, visit, tribute, or letter. The founder of the day is Anna Jarvis, of Philadelphia, who designated the second Sunday in May, or for schools the second Friday, as the time, and a white carnation as the badge. [Webster 1913 Suppl.]