Definition of thanks·giv·ing
- the expression of gratitude, esp. to God.
"he offered prayers in thanksgiving for his safe arrival"
- (in North America) an annual national holiday marked by religious observances and a traditional meal including turkey. The holiday commemorates a harvest festival celebrated by the Pilgrims in 1621, and is held in the US on the fourth Thursday in November. A similar holiday is held in Canada, usually on the second Monday in October.