n.
Variant: or pos · til · lion
Pronunciation: p ō - ' stil-y ə n, p ə -
Function: noun
Etymology: Middle French postillon mail carrier using post-horses, from Italian postiglione, from posta post ― more at POST
Date: circa 1611
: one who rides as a guide on the near horse of one of the pairs attached to a coach or post chaise especially without a coachman