means Free from disturbance, conflict, or anxiety; calm and tranquil.

from Built from 'peace' — which came into English through Old French 'pais' from Latin 'pax,' the same root behind 'pacify' and 'Pacific' — plus the gentle suffix '-ful,' meaning 'full of.' So at its core the word literally means 'full of peace,' and that Latin 'pax' carried the sense of a binding agreement, a truce, the absence of war, which is why peace has always felt less like luck and more like something settled.