large organized groups of soldiers trained to fight in wars; military forces belonging to a country or commander.
From Latin 'armata' (armed, equipped), related to 'arma' (weapons). It entered English in the 1200s describing organized military forces.
The word 'army' comes from Latin 'arma' meaning 'weapons'—so an army is literally a group organized around weapons, which explains why they're so focused on combat equipment!
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