Definition from Nolo’s Plain-English Law Dictionary

1) A person or entity who is requested or named to act for another, such as an agent or trustee. 2) A potential successor to another's rights under a contract. For example, in a real estate purchase agreement, Bob Smith might purchase the property but agree that ownership will be granted to "Bob Smith or nominee." 3) A person chosen by convention, petition, or primary election to be a candidate for public office.

Definition provided by Nolo’s Plain-English Law Dictionary.