Informal abbreviation for ammunition, referring to projectiles fired from weapons. Can also be used metaphorically to mean supporting material or arguments.
Shortened form of ammunition, which comes from French la munition, from Latin munitio meaning 'fortification' or 'defense'. The abbreviation 'ammo' emerged in military slang during the 20th century for brevity in combat situations.
The word 'ammo' perfectly demonstrates how high-stress environments create abbreviated language - soldiers needed quick, clear communication, so lengthy words like 'ammunition' got compressed! It's now so common that many people don't even realize it's an abbreviation.
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