1) One who is opposed to war, military ideals and preparedness.
Explanation:
Pacifism is a group of doctrines aimed to mantain peace between nations. It oposes war and other violent manifestations through political or religious movements or a specific ideology. Some of the means by which a pacifistperson expresses his/her ideology are: active non-violence, diplomacy, civil disobedience, boycott, conscientious objection, public campaigns and peace education.