An individual person or thing that is separate from others. He decided to travel as a single to enjoy some solitude.
A hit in baseball that allows the batter to reach first base. The player hit a single to start the inning.
A song or track released separately from an album, typically to promote the album. The band released a new single ahead of their upcoming album.
A one-way ticket for a journey. She bought a single to London for her business trip.
A person who is not married or in a romantic relationship. He has been a single for most of his adult life.