[ pruh-prahy-i-ter-ee ]
/ prəˈpraɪ ɪˌtɛr i /


noun, plural pro·pri·e·tar·ies.

Nearby words

  1. propr.,
  2. propraetor,
  3. propraetorial,
  4. propranolol,
  5. propria,
  6. proprietary colony,
  7. proprietary hospital,
  8. proprietary medicine,
  9. proprietary name,
  10. proprieties

Origin of proprietary

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

Related formspro·pri·e·tar·i·ly [pruh-prahy-i-tair-i-lee, -prahy-i-ter-] /prəˌpraɪ ɪˈtɛər ɪ li, -ˈpraɪ ɪˌtɛr-/, adverbnon·pro·pri·e·tar·y, adjective, noun, plural non·pro·pri·e·tar·ies. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for proprietary

British Dictionary definitions for proprietary


/ (prəˈpraɪɪtərɪ, -trɪ) /


of, relating to, or belonging to property or proprietors
privately owned and controlled
med of or denoting a drug or agent manufactured and distributed under a trade nameCompare ethical (def. 3)

noun plural -taries

Derived Formsproprietarily, adverb

Word Origin for proprietary

C15: from Late Latin proprietārius an owner, from proprius one's own

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for proprietary



mid-15c., "possessing worldly goods in excess of a cleric's needs," from Medieval Latin proprietarius "owner of property," noun use of Late Latin adjective proprietarius "of a property holder," from Latin proprietas "owner" (see property). Meaning "held in private ownership" is first attested 1580s. The word was used earlier in English as a noun meaning "proprietor," also "worldly person" (c.1400), from a noun use in French and Medieval Latin.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for proprietary


[ prə-prīĭ-tĕr′ē ]


Exclusively owned, as of a hospital.
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.