/ ˈɑːməmənt; NAmE ˈɑːrm-/ noun
1.
[ C , usually pl. ] weapons, especially large guns, bombs, tanks, etc. :
the armaments industry
2.
[ U ] the process of increasing the amount of weapons an army or a country has, especially to prepare for war.
—compare disarmament
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WORD ORIGIN
late 17th cent. (in the sense force equipped for war ): from Latin armamentum , from armare to arm, from arma armour, arms.