Emily Dickinson Lexicon

SE-RENE, a. [Fr. serein; It. and Sp. sereno; L. serenus; Russ. ozariayu, Heb. Ch. Syr. and Ar. זהר, to shine. Class Sr, No. 2, 23, 47.]

1. Clear or fair, and calm; as, a serene sky; serene air. Serene imports great purity.
2. Bright. The moon, serene in glory, mounts the sky. Pope.
3. Calm; unruffled; undisturbed; as, a serene aspect; a serene soul.
4. A title given to several princes and magistrates in Europe; as, serene highness; most serene.