n. (pl. -ies) 1 tranquillity, being serene. 2 (Serenity) a title used in addressing and referring to a reigning prince or similar dignitary (your Serenity).
[ F sérénité or L serenitas (as SERENE) ]
SERENITY
Meaning of SERENITY in English
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012