From French propriétaire, from Latin proprietarius. Compare with the Latin proprietas (property) and proprius (ownership).


  • (US) IPA(key): /pɹəˈpɹɑɪətɛɹi/
  • (file)


proprietary (comparative more proprietary, superlative most proprietary)

  1. Of or relating to property or ownership.
    proprietary rights
  2. Owning something; having ownership.
    the proprietary class
  3. Created or manufactured exclusively by the owner of intellectual property rights, as with a patent or trade secret.
    The continuous profitability of the company is based on its many proprietary products.
    • 1996, Michael Craig Budden, Protecting Trade Secrets under the Uniform Trade Secrets Act: Practical Advice for Executives, Westport, Conn.: Quorum Books, →ISBN, page 20:
      It was reported that the recipes for the secret sauce and grinder sandwiches were proprietary, known only to the current president of the corporation and the former owner of the restaurant.
  4. Nonstandard and controlled by one particular organization.
    a proprietary extension to the HTML standard for Web page structure
  5. Privately owned.
    a proprietary lake; a proprietary chapel
  6. (of a person) Possessive, jealous, or territorial.


The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Wiktionary:Entry layout § Translations.


proprietary (plural proprietaries)

  1. A proprietor or owner.
    (Can we find and add a quotation of Fuller to this entry?)
  2. A body of proprietors, taken collectively.
  3. The rights of a proprietor.
  4. A monk who had reserved goods and belongings to himself, notwithstanding his renunciation of all at the time of profession.