A general peace and serenity newly succeeded a
general trouble. --Sir W.
Temple.
2. Calmness of mind; eveness of temper; undisturbed state;
coolness; composure.
I can not see how any men should ever transgress
those moral rules with confidence and serenity.
--Locke.
Note: Serenity is given as a title to the members of certain
princely families in Europe; as, Your Serenity.