Belonging to a proprietor or owner; of or pertaining to property or ownership: as, proprietary rights.n. One who has exclusive title; one who possesses or holds the title to a thing in his own right; an owner; a proprietor; specifically, in American colonial history, the grantee or owner, or one of the owners, of one of those colonies called proprietary colonies (in distinction from charter colonies and royal colonies or provinces). See colony, 1.n. A body of proprietors collectively: as, the proprietary of a county.n. The right of proprietor; ownership.n. In monasteries, a monk who had reserved goods and effects to himself, not withstanding his renunciation of all at the time of his profession.