adj. & n.
--adj. (serener, serenest)
1. a (of the sky, the air, etc.) clear and calm. b (of the sea etc.) unruffled.
2 placid, tranquil, unperturbed.
--n. poet. a serene expanse of sky, sea, etc.
Phrases and idioms:
all serene Brit. sl. all right. Serene Highness a title used in addressing and referring to members of some European royal families (His Serene Highness; Their Serene Highnesses; Your Serene Highness).
Derivatives:
serenely adv. sereneness n.
Etymology: L serenus