Post

A conveyance for letters or dispatches. The word is derived from "positi," the horses carrying the letters or dispatches being kept or placed at fixed stations. The word is also applied to the person who conveys the letters to the houses where he takes up and lays down his charge, and to the stages or distances betwcen house and house. Hence the phrases, post-bay, post-horse, posthouse, etc.

Wharton.

Lat. After; occurring in a report or a text-book, is used to send the reader to a subsequent part of the book.