Dictionary: freedom of the mind from annoyance, distraction, anxiety, an obsession, etc.; tranquillity; serenity.
My definition: Not easily swayed, panicked, unreasonably demanding or anxious, lets things flow in their own time
“The question of real, lasting world peace concerns human beings, so basic human feelings are also at its roots. Through inner peace, genuine world peace can be achieved. In this the importance of individual responsibility is quite clear; an atmosphere of peace must first be created within ourselves, then gradually expanded to include our families, our communities, and ultimately the whole planet.”