course of living or nourishment; what is eaten and drunk habitually; food; victuals; fare.-a course of food selected with reference to a particular state of health; prescribed allowance of food; regimen prescribed.-to cause to take food; to feed.-to cause to eat and drink sparingly, or by prescribed rules; to regulate medicinally the food of.-to eat; to take one's meals.-to eat according to prescribed rules; to ear sparingly; as, the doctor says he must diet.-a legislative or administrative assembly in germany, poland, and some other countries of europe; a deliberative convention; a council; as, the diet of worms, held in 1521.