singl

1. (in music) single
   Bend je izbacio novi singl prošle nedelje. — The band released a new single last week.
2. (in tennis) singles
   Osvojio je titulu u singlu. — He won the singles title.

3. colloq. (of a person) single; not in a relationship
   Ona je singl već dve godine. — She's been single for two years.

In the sense 'not in a relationship' it is indeclinable: on je singl, ona je singl. As a noun it occurs in the plural: singlovi — single people.