Meaning of serene

se•rene

1. calm, peaceful, or tranquil; unruffled: a serene landscape; serene old age.
2. clear; fair: serene weather.
3. (usually cap.) most high or august (used as a royal epithet, usually prec. by his, your, etc.): His Serene Highness.

1. serenity; tranquillity.
2. a clear or tranquil expanse of sea or sky.