calmness of temperament; composure; calmness; imperturbability
When I was younger I was constantly tormented by unruly emotions, but by the time I was forty I had calmed down and attained a certain measure of equanimity.
aequus (even, level)#animus (mind, spirit) (Latin)
EQUAL+ENEMY (ity) Seeing the enemy as a friend i.e. with CALMNESS OF TEMPERAMENT. equal mind equi + anim - when one thinks about other creatures as equal to himself, he or she has a great composure of mind and is calm and thoughtful about others.