Definition of Feud
Feudal law. An estate in land held of a superior on condition of rendering him services. 2 Bl.Comm. 105. An inheritable right to the use and occupation of lands, held on condition of rendering services to the lord or proprietor, who himself retains the property in the lands.
In this sense the word is the same as "feod”, "feodum”, "feudum”, "fief’, or "fee”.
Saxon and old German law. An enmity, or species of private war, existing between the family of his slayer. In Scotland and the north of England, a combination of all the kin to revenge the death of any of the blood upon the slayer and all his race. See Faida.
That's the definition of Feud in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.