D defs.my
Entry 3 senses Webster, 1913

Muniment

· Mu·ni·ment · IPA /ˈmjuːnɪmənt/
01 n. The act of supporting or defending.
  1. 1.
    The act of supporting or defending.[Obs.]
  2. 2.
    That which supports or defends; stronghold; place or means of defense; munition; assistance.
  3. 3.
    A record; the evidences or writings whereby a man is enabled to defend the title to his estate; title deeds and papers.(Law)
Phrases & compounds
Muniment room — that room in a cathedral, castle, or other public building, which is used for keeping the records, charters, seals, deeds, and the like.