1. Projectiles, such as bullets and shot, together with their fuses and primers, that can be fired from guns or otherwise propelled.
2. Nuclear, biological, chemical, or explosive materials, such as rockets or grenades, that are used as weapons.
3. Objects used as missiles in offense or defense: Rocks were my only ammunition against the bear.
4. A means of attacking or defending an argument, thesis, or point of view.
[Obsolete French amunition, from l'amunition, the provisioning, alteration of la munition, from Old French, from Latin mūnītiō, mūnītiōn-, fortification; see MUNITION.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.