Year-and-a-day Rule: A common law rule precluding prosecution for murder where the victim died a year and a day, or later, after the infliction of the ultimately fatal wounds. | Legal Definition of Year-and-a-day Rule

Yellow Dog Contract: A name given in American labor law to contract of employment by which the employee promises not to join a union and to forfeit employment if he/she joins a union during the period of employment. | Legal Definition of Yellow Dog Contract

York-Antwerp Rules: A set of internationally-accepted rules, first published in 1890, proposing points of detail in the application of the maritime law principle of general average. | Legal Definition of York-Antwerp Rules

Young Offender: Young persons who, in many states, are treated differently than adult criminals and are tried in special youth courts. | Legal Definition of Young Offender

Yukky: Distasteful or contemptible. | Legal Definition of Yukky