ammunition主要指彈藥（projectiles to be fired from a gun）
munition（usu.pl.)指軍需品的總稱（military supplies considered collectively：including military weapons,ammunition and equipment)
But in the archaism ammunition also has the meaning of 軍需品，later replaced by munition in this meaning.
古語中ammunition 有軍需品的意思，後來因為munition用來指軍需品，ammunition就主要指彈藥。
用法：
munition可作n./vt./vi.
vt.供應…軍需品：例句: We have been munitioned and ready for the battle.我們軍需品齊備，已做好了戰鬥準備。
vi.從事軍需品生產
adj.軍需品的；生產軍需品的
ammunition可作n./v
作n.時有比喻義：[比喻]炮彈(可用來為自己辯護或攻擊別人的依據、證據、材料等)，進攻(或防禦)手段
vt./vi.裝彈藥(於)；供彈藥(給)