1
: marked by or suggestive of utter calm and unruffled repose or quietude
a serene smile
2
a
: clear and free of storms or unpleasant change
serene skies
b
: shining bright and steady
the moon, serene in glory—Alexander Pope
3
: august
—used as part of a title
His Serene Highness
serenely
adverb
1
archaic
: a serene condition or expanse (as of sky, sea, or light)
2
archaic
: serenity, tranquility
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Merriam-Webster unabridged
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