- a person who rides the left-hand horse of the leaders of a four-horse carriage
- one who rides the left-hand horse of a two-horse carriage when there is no driver
Origin of postilionFrench postillon ; from Italian postiglione ; from posta, post
Origin of postilionFrench postillon, from Italian postiglione, from posta, mail, from Old Italian, mail station; see post3.
From Middle French postillon, and its likely source, Italian postiglione (“guide for driver of post-coach"), from posta (“post").