'Pillion' definitions:

Definition of 'pillion'

From: WordNet
noun
A seat behind the rider of a horse or motorbike etc.

Definition of 'Pillion'

From: GCIDE
  • Pillion \Pil"lion\, n. [Ir. pillin, pilliun (akin to Gael. pillean, pillin), fr. Ir. & Gael. pill, peall, a skin or hide, prob. fr. L. pellis. See Pell, n., Fell skin.]
  • 1. A panel or cushion saddle; the under pad or cushion of saddle; esp., a pad or cushion put on behind a man's saddle, on which a woman may ride. [1913 Webster]
  • His [a soldier's] shank pillion without stirrups. --Spenser. [1913 Webster]
  • 2. A saddle or seat behind the driver's saddle on a motorcycle, used by passengers. [PJC]