A country in southeastern Europe. Official name: Republic of Serbia / A region in southeastern Europe

A female given name from English in general use since the 1990s.

A female given name from English. A rare variant of Serena.

plural of serum (alternative form of serums).

(manner) In a serious or literal manner. / Gravely; deeply; very much. / Used to attempt to introduce a serious point in a less serious conversation.

The state or quality of being serious.

(chemistry) any series of aliphatic organic compounds whose members differ only in the addition of a CH₂ group; for example, the carboxylic acids, CH₃(CH₂)ₙCOOH where n is any whole number

A love song that is sung directly to one's love interest, especially one performed below the window of a loved one in the evening. / (music) An instrumental composition in several movements.

(transitive) To sing or play a serenade for (someone).

The practice of having a succession of (especially short) monogamous relationships with different people.