- a pad or cushion attached behind a saddle, especially as a seat for a woman.
- a pad, cushion, saddle, or the like, used as a passenger seat on a bicycle, motor scooter, etc.
- a passenger’s saddle or seat behind the driver’s seat on a motorcycle.
- a seat or place behind the rider of a motorcycle, scooter, horse, etc
- on a pillionto ride pillion
n.kind of saddle, c.1500, of Celtic origin (cf. Irish pillin, Gaelic pillin), ultimately from Latin pellis “skin, pelt” (see film (n.)).