The Collaborative International Dictionary of English v.0.48:

Post \Post\, v. t. [imp. & p. p. Posted; p. pr. & vb. n.
   Posting.]
   1. To attach to a post, a wall, or other usual place of
      affixing public notices; to placard; as, to post a notice;
      to post playbills.
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   Note: Formerly, a large post was erected before the sheriff's
         office, or in some public place, upon which legal
         notices were displayed. This way of advertisement has
         not entirely gone of use.
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   2. To hold up to public blame or reproach; to advertise
      opprobriously; to denounce by public proclamation; as, to
      post one for cowardice.
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            On pain of being posted to your sorrow
            Fail not, at four, to meet me.        --Granville.
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   3. To enter (a name) on a list, as for service, promotion, or
      the like.
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   4. To assign to a station; to set; to place; as, to post a
      sentinel. "It might be to obtain a ship for a lieutenant,
      . . . or to get him posted." --De Quincey.
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   5. (Bookkeeping) To carry, as an account, from the journal to
      the ledger; as, to post an account; to transfer, as
      accounts, to the ledger.
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            You have not posted your books these ten years.
                                                  --Arbuthnot.
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   6. To place in the care of the post; to mail; as, to post a
      letter.
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   7. To inform; to give the news to; to make (one) acquainted
      with the details of a subject; -- often with up.
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            Thoroughly posted up in the politics and literature
            of the day.                           --Lond. Sat.
                                                  Rev.
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   To post off, to put off; to delay. [Obs.] "Why did I,
      venturously, post off so great a business?" --Baxter.

   To post over, to hurry over. [Obs.] --Fuller.
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WordNet (r) 3.0 (2006):

posted
    adj 1: publicly announced; "the posted speed limit"

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "posted":
   abreast of, as earnest, assigned, at stake, au courant, booked,
   briefed, deployed, deposited, documented, down, educated,
   embosomed, emplaced, enlightened, enrolled, ensconced, entered,
   established, filed, fixed, in hock, in pawn, indexed, informed,
   inscribed, installed, instructed, legal, located, logged, minuted,
   of record, official, on deposit, on file, on record, on the books,
   pawned, placed, planted, pledged, positioned, primed, put up,
   recorded, registered, schooled, seated, set, settled, situate,
   situated, spotted, staked, stationed, taught, trained, up on,
   up the spout, up-to-date, versed, well-versed, written down