/seuh ren"i tee/ , n. , pl. serenities for 2.
1. the state or quality of being serene, calm, or tranquil; sereneness.
2. ( usually cap. ) a title of honor, respect, or reverence, used in speaking of or to certain members of royalty (usually prec. by his, your, etc.).
[ 1400-50; late ME serenite serenitas. See SERENE, -ITY ]
Syn. 1. composure, calm, peacefulness, peace.
Ant. 1. agitation.