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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.
Contemporary Examples

The WWI-era equipment had been acquired from a Polish ammunition factory in the late 1930s.
Israel Had a Secret, Underground Bullet Factory Nina Strochlic July 17, 2014

Law-enforcement officials are now looking into whether any of that money was used to buy weapons and ammunition.
Suspected Gunman James Holmes’s Campus Mayhem Christine Pelisek, Eliza Shapiro July 23, 2012

Authorities found a loaded semi-automatic gun they believe Benton discarded on a nearby hillside and ammunition in his car.
Pepperdine President’s Son Chris Benton Arrested Jamie Reno August 24, 2012

Barbour provided the ammunition in what was otherwise a friendly profile in a conservative magazine.
Haley Barbour’s Mississippi Memories Howard Kurtz December 20, 2010

Months before, he had gone online to buy thousands of rounds of ammunition for these weapons.
Would Truth Serum Work on James Holmes in the Aurora Shooting Trial? Kent Sepkowitz March 13, 2013

Historical Examples

Water and food they still had in abundance, but ammunition was running low.
A Soldier’s Trial Charles King

I’m not sure that it would shoot if I had ammunition, but I’d like to try.
In the Midst of Alarms Robert Barr

But by the year following they were better prepared, for they had obtained guns and ammunition from the traders.
Then and Now Robert Vaughn

Presents to Indians to consist chiefly of arms, ammunition, and whisky.
Punchinello, Vol. 1, No. 3, April 16, 1870 Various

Artillery, wagons and ammunition piled up in disorder; from people along the way reports of fighting.
The Fourth Massachusetts Cavalry in the Closing Scenes of the War for the Maintenance of the Union, from Richmond to Appomatox William B. Arnold

noun
any projectiles, such as bullets, rockets, etc, that can be discharged from a weapon
bombs, missiles, chemicals, biological agents, nuclear materials, etc, capable of use as weapons
any means of defence or attack, as in an argument
n.

1620s, from French soldiers’ faulty separation of Middle French la munition into l’ammunition; from Latin munitionem (nominative munitio) “a fortifying” (see munition), and at first meaning all military supplies in general. 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.

modifier

: The fat ammo barge rocked up and down

noun

Ammunition: The platoon is out of ammo (1930+)
Information and other material that may be used in a debate, campaign, expose´, etc: Your shabby personal life gives lots of ammo to the opposition
Toilet paper