Peace is an occurrence of harmony characterized by lack of violence, conflict behaviors and the freedom from fear of violence. Commonly understood as the absence of hostility and retribution, peace also suggests sincere attempts at reconciliation, the existence of healthy or newly healed interpersonal or international relationships, prosperity in matters of social or economic welfare, the establishment of equality, and a working political order that serves the true interests of all.
Defined by wikipedia
John Lennon said:
Imagine all the people living life in peace. You may say I’m a dreamer, but I’m not the only one. I hope someday you’ll join us, and the world will be as one.