Se-rĕn'i-ty, n.
n. [Lat. serenitas, Fr. sérénité, Pr. serenitat, Sp. serenidad, It. serenità.]
Sense 1. The condition or quality of being serene; clearness and calmness; quietness; stillness; peace. A general peace and serenity newly succeeded general trouble. Sir W. Temple.
Sense 2. Calmness of mind; evenness of temper; undisturbed state; coolness.
I can not see how any men should transgress those moral rules with confidence and serenity. Locke.
☞ Serenity is used as a title belonging to certain ranks and degrees of dignity; as, your serenity.