Meanings
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1
noun
information that can be used to attack or defend a claim or argument or viewpoint
The admission provided ammunition for our critics.
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2
noun
Articles used in charging firearms and ordnance of all kinds; as powder, balls, shot, shells, percussion caps, rockets, etc.
Hiro risks turning on a small flashlight, uses it to rummage around the yatcht, picking up valuable stuff: a few bottles of (presumably) drinkable water, some food, extra ammunition for his nine.
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3
noun
Military stores, or provisions of all kinds for attack or defense.
Ammunition bread.
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4
noun
Arguments and information that can be used against the other party in a conflict.
They say that the booklet gives them ammunition which is proving effective in breaking down resistance against home building which was created by false propaganda.
Thesaurus
Etymology
From older French amunition, rebracketing of la munition (“the war supplies”) as l'amunition. Ultimately from Latin; see munition for more.