Noah Webster's Dictionary 1. (n.) The quality or state of being serene; clearness and calmness; quietness; stillness; peace. 2. (n.) Calmness of mind; evenness of temper; undisturbed state; coolness; composure.

Multi-Version Concordance Serenity (1 Occurrence) Job 29:24 If I laughed on them, they believed it not; and they troubled not the serenity of my countenance. (DBY)