letters patent

/L EH1 T ER0 Z P AE1 T AH0 N T/
noun
  1. 1

    A type of legal document which is an open letter issued by an authority granting a right, monopoly, title, or status to a person or organization.

noun
  1. 1

    A type of legal document in the form of an open letter issued by an authority granting a monopoly, right, status, or title to a person or organization.

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Source: https://en.wiktionary.org/wiki/letter%20patent, https://en.wiktionary.org/wiki/letters%20patent