belonging to a proprietor.
being a proprietor; holding property: the proprietary class.
pertaining to property or ownership: proprietary wealth.
belonging or controlled as property.
manufactured and sold only by the owner of the patent, formula, brand name, or trademark associated with the product: proprietary medicine.
privately owned and operated for profit: proprietary hospitals.
noun, plural proprietaries.
an owner or proprietor.
a body of proprietors.
American History. the grantee or owner, or one of the grantees or owners, of a proprietary colony.
something owned, especially real estate.
a proprietary medicine.
Also called proprietary school. a school organized as a profit-making venture primarily to teach vocational skills or self-improvement techniques.

1400–50; late Middle English (noun) < Medieval Latin proprietārius owner, noun use of Late Latin: of an owner, of ownership. See propriety, -ary

proprietarily [pruh-prahy-i-tair-i-lee, -prahy-i-ter-] , adverb
nonproprietary, adjective, noun, plural nonproprietaries. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
proprietary (prəˈpraɪɪtərɪ, -trɪ)
1.  of, relating to, or belonging to property or proprietors
2.  privately owned and controlled
3.  med Compare ethical of or denoting a drug or agent manufactured and distributed under a trade name
n , -taries
4.  med a proprietary drug or agent
5.  a proprietor or proprietors collectively
6.  a.  right to property
 b.  property owned
7.  Also called: lord proprietary (in Colonial America) an owner, governor, or grantee of a proprietary colony
[C15: from Late Latin proprietārius an owner, from proprius one's own]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-15c., "possessing worldly goods in excess of a cleric's needs," from M.L. proprietarius "owner of property," noun use of L.L. adj. proprietarius "of a property holder," from L. proprietas "owner" (see property). Meaning "held in private ownership" is first attested 1580s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

proprietary pro·pri·e·tar·y (prə-prī'ĭ-těr'ē)

  1. Exclusively owned, as of a hospital.

  2. Owned by an individual or corporation under a trademark or patent, as of a drug.

A proprietary medicine.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

proprietary definition

1. In marketroid-speak, superior; implies a product imbued with exclusive magic by the unmatched brilliance of the company's own hardware or software designers.
2. In the language of hackers and users, inferior; implies a product not conforming to open-systems standards, and thus one that puts the customer at the mercy of a vendor who can inflate service and upgrade charges after the initial sale has locked the customer in.
[Jargon File]
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
For a business, that information would be proprietary.
Ending proprietary funding, end closed research results, restore peer review.
PCs used to be a crucial part of any big, corporate technology purchase because
  they were expensive and proprietary.
Pharmaceutical firms are profit-making enterprises, which often earn huge
  profits from proprietary drugs.
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