aggression /a'grejn; a'grEjan/ n 1 [U] unprovoked hostility, often beginning a quarrel or war: 侵略; 攻擊; 啟釁： It was difficult to decide which country was guilty of ~ (on/upon the other). 很難判定那一國(guó)犯侵略 (他國(guó)) 之罪。 2 [C] instance of this. 侵略或攻擊之實(shí)例。