An Etymological Dictionary of Astronomy and Astrophysics

1a) An online message that is submitted to a message board or electronic mailing list.

1b) Text, images, etc., that are placed on a website.

2a) To affix (a notice, bulletin, etc.) to a post, wall, or the like.

2b) To place (text, images, etc.) on a website (Dictionary.com).

Etymology (EN): M.E., from O.E. post “pillar, doorpost,” and O.Fr. post “post, upright beam,” both from L. postis “post, doorpost.”

Etymology (PE): Barnemâ, literally “display, show off,” from bar- “on; up; upon; in,” → on-, + nemâ, present stem of nemudan “to show,” → display.