Synonyms for Moderation (same or very similar meaning)
WordNet sense 1 (a change for the better):
relief, easingWordNet sense 2 (quality of being moderate and avoiding extremes):
moderatenessWordNet sense 3 (the trait of avoiding excesses):
temperanceWordNet sense 4 (the action of lessening in severity or intensity):
mitigationFrom the ODE community, based on WordNetadd/edit