(1):

(n.) A body proprietors, taken collectively.

(2):

(n.) A proprietor or owner; one who has exclusive title to a thing; one who possesses, or holds the title to, a thing in his own right.

(3):

(n.) A monk who had reserved goods and effects to himself, notwithstanding his renunciation of all at the time of profession.

(4):

(a.) Belonging, or pertaining, to a proprietor; considered as property; owned; as, proprietary medicine.