the place where the final battle will be fought between the forces of good and evil (probably so called in reference to the battlefield of Megiddo. Rev. 16

16).

the last and completely destructive battle

The arms race can lead to Armageddon.

any great and crucial conflict.

(New Testament) the scene of the final battle between the kings of the Earth at the end of the world

any catastrophically destructive battle; "they called the first World War an Armageddon"