SERENITY
repose, quiet, placidity, serenity, tranquillity, tranquility
(noun) a disposition free from stress or emotion
peace, peacefulness, peace of mind, repose, serenity, heartsease, ataraxis
(noun) the absence of mental stress or anxiety
Source: WordNet® 3.1
Etymology
Noun
serenity (countable and uncountable, plural serenities)
The state of being serene; calmness; peacefulness.
A lack of agitation or disturbance.
A title given to a reigning prince or similar dignitary.
Synonyms
• sereneness
• tranquility / tranquillity
• harmony
• peace
title
• Serene Highness
Proper noun
Serenity
A female given name from English in general use since the 1990s.
Source: Wiktionary
Se*ren"i*ty, n. Etym: [L. serenuas: cf. F. sérénité.]
1. The quality or state of being serene; clearness and calmness;
quietness; stillness; peace.
A general peace and serenity newly succeeded a general trouble. Sir
W. Temple.
2. Calmness of mind; eveness of temper; undisturbed state; coolness;
composure.
I can not see how any men should ever transgress those moral rules
with confidence and serenity. Locke.
Note: Serenity is given as a title to the members of certain princely
families in Europe; as, Your Serenity.
Source: Webster’s Unabridged Dictionary 1913 Edition