A person who restores peace, especially by settling disputes. / (non-native speakers' English, medicine) Misconstruction of pacemaker.

The act of preserving peace, specifically between hostile groups or states, especially by a sanctioned military force. / (as a noun modifier) (for example) a peacekeeping force.

One that preserves the peace. / A member of a military force charged with peacekeeping duties in a troublespot.

Favouring peace rather than conflict; not aggressive, tending to avoid violence (of people, actions etc.). / Characterized by peace; peaceful, tranquil.

In a peaceful manner.

The creation of peace or the conditions for peace. / The reconstruction of physical and societal institutions after a conflict

In a peaceable manner.

The act of reconciling two people or groups who disagree.

The period of time when a nation or people is at peace, not fighting a war.

plural of peacenik