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. Free of noise and disturbance, with little activity
   "a serene scene by the river";
   - calm, tranquil, peaceful
    
3. Completely clear and fine
   "serene skies and a bright blue sea"

Derived forms: serener, serenest

See also: clear, composed, halcyon, quiet

Encyclopedia: Serene, Colorado