1. Fidelity to one's lord; the feudal obligation by which the tenant or vassal was bound to be faithful to his lord; the special oath by which this obligation was assumed; fidelity to a superior power, or to a government; loyality. It is no longer the practice to exact the performance of fealty, as a feudal obligation.
2. Fidelity; constancy; faithfulness, as of a friend to a friend, or of a wife to her husband. He should maintain fealty to god. (i. Taylor) Makes wicked lightnings of her eyes, and saps The fealty of our friends. (tennyson) Swore fealty to the new government. (Macaulay)