1. Content or composed; untroubled: "She remained serene in the face of her accusers" (Peter Matthiessen).
2. Unaffected by disturbance; calm or peaceful: a serene forest. See Synonyms at calm.
3. Unclouded; fair: serene skies and a bright blue sea.
4. often Serene Used as a title and form of address for certain members of royalty: Her Serene Highness; His Serene Highness.
[Middle English, from Latin serēnus, serene, clear.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.