- a sleeveless athletic jersey, especially a loose-fitting top worn by runners, joggers, etc.
- a single unit; an unpaired or separate item.
- a man's undershirt or jersey.
- a man's sleeveless undergarment covering the body from the shoulders to the hips
- a similar sleeveless garment worn as outerwear
- a garment worn with shorts by athletes, boxers, etc
- a black woollen outer garment worn by bushmen
- a multiplet that has only one member
- a chemical bond consisting of one electron
