interjection[]
peace
Salutation or farewell, comparable to the Arabic greeting: "As-Salaam Alaikum". "And that is to bring the peace, not in the flower but the As-Salaam Alaikum in the third I am" -- De La Soul (I Am I Be)
Although everyone from Jews (using the Hebrew word "Shalom") to Hawaiians (using their word "Aloha") uses their word meaning "peace" to say Hello and Goodbye, the use of the word "Peace" that way in English was started by the hippies in the 1960s.
Hip-hop updated the term to "peace out", "one" or "one love".