WordWeb Online

1. Not agitated; without losing self-possession
   "he remained serene in the midst of turbulence"; "a serene expression on her face";
   - calm, unagitated, tranquil
    
2. Completely clear and fine
   "serene skies and a bright blue sea"

Derived forms: serener, serenest

See also: clear, composed

Encyclopedia: Serene Serene, CO Serene, Colorado