Can you give me three definitions of the VERB "POST"?

The answer above is based upon American usage and omits the meaning of "post" as used in the UK - to place and letter or parcel in the Mail System. The other answer offers the remaining two usages.

verb (used with object)

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

8. to bring to public notice by or as by a poster or bill: to post a reward.

9. to denounce by a public notice or declaration: They were posted as spies.

10. to publish the name of in a list: to post a student on the dean's list.

11. to publish the name of (a ship) as missing or lost.

12. to placard (a wall, fence, etc.) with notices, bulletins, etc.: The wall was posted with announcements.

13. to put up signs on (land or other property) forbidding trespassing:: The estate has been posted by the owner.

14. Computers.

a. to send (a message) to a newsgroup.

b. to place (text) on a Web site.