Etymology
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ammunition (n.)

1620s, "military stores and provisions," from French soldiers' faulty separation of French la munition, as if *l'amunition; from Latin munitionem (nominative munitio) "a fortifying" (see munition).

The mistake in the word perhaps was by influence of French a(d)monition "warning." The error was corrected in French (Modern French munition), but retained in English, with spelling conformed to words in Latin. At first meaning all military supplies in general, in modern use only material used in the discharge of firearms and ordnance.

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Definitions of ammunition

ammunition (n.)
projectiles to be fired from a gun;
Synonyms: ammo
ammunition (n.)
any nuclear or chemical or biological material that can be used as a weapon of mass destruction;
ammunition (n.)
information that can be used to attack or defend a claim or argument or viewpoint;
his admission provided ammunition for his critics
From wordnet.princeton.edu