- 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 post 3.
From Middle French postillon, and its likely source, Italian postiglione (“guide for driver of post-coach"), from posta (“post").