the expression of gratitude, especially to God

he offered prayers in thanksgiving for his safe arrival

he described the service as a thanksgiving

(in North America) an annual national holiday marked by religious observances and a traditional meal. The holiday commemorates a harvest festival celebrated by the Pilgrim Fathers 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

families gather for Thanksgiving

I hope you all have a wonderful Thanksgiving

a Thanksgiving dinner