noun
war; disturbance; military conflict
A somewhat formal or literary term for armed conflict or upheaval; not an everyday word for 'war' (戦争 is more common).
その時代は兵乱が絶えなかった。
In that era, military disturbances never ceased.
兵乱を避けて人々は山奥へ逃れた。
People fled deep into the mountains to escape the war.