[se.rene] adj [L serenus clear, cloudless, untroubled] (15c) 1 a: clear and free of storms or unpleasant change "~ skies" b: shining bright and steady "the moon, ~ in glory --Alexander Pope"
2: august--used as part of a title "His Serene Highness"
3: marked by or suggestive of utter calm and unruffled repose or quietude "a ~ smile" syn see calm -- se.rene.ly adv -- se.rene.ness n
[2]serene n (1644) 1 archaic: a serene condition or expanse (as of sky, sea, or light)
2. archaic: serenity, tranquillity