Se‐ren″i‐ty (?), n. [L. serenuas: cf. F. sérénité.] 1. The quality or state of being serene; clearness and calmness; quietness; stillness; peace.
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.
☞ Serenity is given as a title to the members of certain princely families in Europe; as, Your Serenity.