Sui generis
Sui generis (; ) is a Latin phrase that means "of its (his, her, their) own kind; in a class by itself; unique."
Seignory
Every seignory now existing must have been created before the statute "Quia Emptores" (1290), which forbade the future creation of estates in fee-simple by subinfeudation. The only seignories of any importance at present are the lordships of manors. They are regarded as incorporeal hereditaments, and are either appendant or in gross. A seignory appendant passes with the grant of the manor; a seignory in gross—that is, a seignory which has been severed from the demesne lands of the manor to which it was originally appendant—must be specially conveyed by deed of grant.