From Anglo-Norman muniment, Middle French muniment, and their source, Latin mūnīmentum, from mūnīre.

• (British) IPA: /ˈmjuːnɪmənt/

muniment (plural muniments)

1. (chiefly, legal) A deed, or other official document kept as proof of ownership or rights or privileges; an archived document. [from 15th c.]
   • 1966, Jerusalem Bible, Ezra 6:1, London: Darton, Longman & Todd:

     Then, on the order of King Darius, a search was made in Babylonia in the muniment rooms where the archives were kept […]

2. (obsolete, in the plural) Things which a person or place is equipped with; effects, furnishings, accoutrements. [15th]
3. (obsolete) Something used as a defence. [16th]
   • c. 1608–1609 (date written), William Shakespeare, “The Tragedy of Coriolanus”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC ↗, [Act I, scene i]:

     other muniments and petty helps