serenity

 
Pronunciation: /sɪˈrɛnɪti/

noun (plural serenities)

[mass noun]
  • the state of being calm, peaceful, and untroubled: an oasis of serenity amidst the bustling city

Origin:

late Middle English: from Old French serenite, from Latin serenitas, from serenus 'clear, fair' (see serene)