Dictionary.net

aggressiveness that involves the threat of using military force

a political orientation of a people or a government to maintain a strong military force and to be prepared to use it aggresively to defend or promote national interests

Warlike or fighting spirit or policy; dependence of a government on the power of its armies for its strength; as, militarism in a country is liable to lead to war.

An excess of the military spirit.

Military dominancy.