n. Fidelity. to a lord; faithful adherence of a tenant or vassal to the superior of whom he holds his lands; the solemn recognition by the tenant, under oath, of his lord's paramount right.n. Fidelity in general, as of one friend to another, of a wife to a husband, etc.; faithfulness; faith; loyalty.n. Synonyms Allegiance. Loyalty, Fealty. See allegiance.