(physics) A multiplet having a single member, especially a single spectroscopic peak. / (physics, quantum mechanics) A quantum state having zero spin.

Alternative spelling of singleplayer

A bar behind draft animals and in front of a load, such as a wagon, that balances the load. Generally the animals are attached at the ends and the wagon or other load to a pivot in the middle of the singletree.

Capable of being sung.

A charge added to a per-person occupancy rate that is based on an assumption of double occupancy, as on a cruise ship.

(sports) A tournament where the loser of a game or match is eliminated from further competition.

plural of single supplement

plural of singalong

A gathering of people who sing together

(of music) designed to allow or encourage the audience to sing along