Pillion is a term used to describe a PASSENGER who sits behind the rider on a motorcycle, horse, or other animal. The word pillion is derived from the Old French word pelion, which means cushion or PAD. The crossword solutions for the term pillion are PASSENGER (9 letters) and PAD (3 letters). The PASSENGER is the person riding on the back of the motorcycle, horse, or other animal, while the PAD is the cushion or seat they sit on.