serenity
https://gyazo.com/5e307bd4bbe2f77c22dd81ff2d4ec8cb
noun (plural serenities)
the state of being calm, peaceful, and untroubled:
落ち着き, 静穏; 晴朗, うららかさ(calmness)
e.g. an oasis of serenity amidst the bustling city.
(His/Your, etc., Serenity) a title given to a reigning prince or similar dignitary.
〖S-〗殿下, 妃殿下 (!敬称)
ORIGIN
late Middle English: from Old French serenite, from Latin serenitas, from serenus ‘clear, fair’ (see serene).