Definition of "serenity"

serenity

/səˈɹɛnɪti/

noun
countable and uncountable, plural serenities
1. The state of being serene; calmness; peacefulness.
  Quotations
  Forthwith a change came over the waters, and the serenity became less brilliant but more profound.
  1899 February, Joseph Conrad, “The Heart of Darkness”, in Blackwood’s Edinburgh Magazine, volume CLXV, number M, New York, N.Y.: The Leonard Scott Publishing Company, […], part I, page 193
  There is no passion, there is serenity.
  1987, Greg Costikyan, “The Jedi Code”, in Star Wars: The Roleplaying Game, page 69, line 3
2. A lack of agitation or disturbance.
3. A title given to a reigning prince or similar dignitary.