[pos.til.ion] or pos.til.lion n [MF postillon mail carrier using post-horses, fr. It postiglione, fr. posta post--more at post] (ca. 1611): one who rides as a guide on the near horse of one of the pairs attached to a coach or post chaise esp. without a coachman
POSTILION
Meaning of POSTILION in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012