definition of
Thanksgiving

[1] #1 Thanksgiving n. [Thanksgiving Day] fourth Thursday in November in the United States; second Monday in October in Canada; commemorates a feast held in 1621 by the Pilgrims and the Wampanoag. wn

[2] #2 Thanksgiving n. [grace, blessing, thanksgiving] a short prayer of thanks before a meal; "their youngest son said grace". wn