A national holiday throughout the USA, annually proclaimed by the President and state Governors for general thanksgiving. First celebrated by the Plymouth colony in 1621 after the first harvest in their new home. In 1863 Lincoln proclaimed the fourth or last Thursday in November as Thanksgiving Day. In 1941, F.D. Roosevelt fixed that day by decree. In most states, it is a great family festival, celebrated with turkey dinner cranberry sauce and pumpkin pie.