the material fired, scattered, dropped, or detonated from any weapon, as bombs or rockets, and especially shot, shrapnel, bullets, or shells fired by guns.
the means of igniting or exploding such material, as primers, fuzes, and gunpowder.
any material, means, weapons, etc., used in any conflict: a crude ammunition of stones.
information, advice, or supplies to help defend or attack a viewpoint, argument, or claim: Give me some ammunition for the debate.
Obsolete. any military supplies.

1620–30; < Middle French amonitions, amunitions (plural) military supplies (a- a-5 + munition < Latin; see munition), or < French la munition, wrongly analyzed as l'amunition Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ammunition (ˌæmjʊˈnɪʃən)
1.  any projectiles, such as bullets, rockets, etc, that can be discharged from a weapon
2.  bombs, missiles, chemicals, biological agents, nuclear materials, etc, capable of use as weapons
3.  any means of defence or attack, as in an argument
[C17: from obsolete French amunition, by mistaken division from earlier la munition; see munition]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1620s, from Fr. soldiers' faulty separation of M.Fr. la munition, from L. munitio "a fortifying," and at first meaning all military supplies in general. The mistake in the word perhaps was by infl. of Fr. a(d)monition "warning." The error was corrected in Fr. (Mod.Fr. munition), but retained in Eng.
Shortened form ammo is attested from 1917.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


the projectiles and propelling charges used in small arms, artillery, and other guns. Ammunition size is usually expressed in terms of calibre, which is the diameter of the projectile as measured in millimetres or inches. In general, projectiles less than 20 mm or .60 inch in diameter are classified as small-arm, and larger calibres are considered artillery. A complete round of ammunition consists of all the components necessary for one firing of the gun. These normally include a projectile, the propellant, and a primer that ignites the propellant. Other components such as cartridge case, fuze, and bursting charge are frequently included.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The ammunition had been cobbled together from multiple sources.
Should there ever be an infringement later, you'll be glad to have this
  additional ammunition.
What does come as a shock, though, is the unmistakable sound of live ammunition.
They also carried supplies of rope, tools, and ammunition.
Images for ammunition
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