n.
Function: adjective
Etymology: Late Latin proprietarius, from Latin proprietas property ― more at PROPERTY
Date: 1589
1 : of, relating to, or characteristic of a proprietor < proprietary rights>
2 : used, made, or marketed by one having the exclusive legal right <a proprietary process> < proprietary software>
3 : privately owned and managed and run as a profit-making organization <a proprietary clinic>