
English word serenity comes from Latin serenus
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serenus (Latin)
(figuratively) Cheerful, glad, joyous.. Clear, fair, bright, serene, tranquil.. That clears the sky or brings fair weather.
serenitas (Latin)
(figuratively) favourable conditions. Serenity; fine weather.
sérénité (Middle French)
serenity (English)
A lack of agitation or disturbance.. A title given to a reigning prince or similar dignitary.. The state of being serene; calmness; peacefulness.