Proprietary meaning : A proprietor or owner. A body of proprietors, taken collectively. The rights of a proprietor. A monk who had reserved goods and belongings to himself, notwithstanding his renunciation of all at the time of profession. Of or relating to property or ownership. Owning something; having ownership. Created or manufactured exclusively by the owner of intellectual property rights, as with a patent or trade secret. Nonstandard and controlled by one particular organization. Privately owned. (of a person) Possessive, jealous, or territorial.