The damp, unwholesome air of evening.
"The team stepped outside to breathe in the heavy, stagnant serena that clung to the city after sunset."
"The new Serena will help you relax and enjoy your favorite music while working out."
A female given name from Latin.
"Serena is a popular female given name derived from the Latin word for clear-weathered or calm."
The word comes from the Italian serena, which is the feminine form of sereno. In English usage, it refers to a clear sky or calm weather rather than its original association with dew found in related Romance languages.