pillion /ˈpɪljən/noun 4verb 3adverb 1forms 3 noun4 •A pad behind the saddle of a horse for a second rider. •A similar second saddle on a bicycle or motorcycle for a passenger. •The person riding in the pillion. •The cushion of a saddle. verb3 •To ride on a pillion.I met a Latvian lass who enjoyed pillioning, showed me her country and best spots — yes, the best way to enjoy a country! — 2011 •To place (a person) on a pillion.But we thought she could start out by pillioning me, and then she can decide whether she still wants to learn to ride her own little bike. — 2018 •To put a pillion on a horse.Accordingly, he saddled and pillioned his horse, thinking he might have the honor of bringing the bride himself. — 1764 adverb1 •Riding behind the driving rider, as when positioned on the rump of a mount. formspillioned · pillioning · pillions