post office

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The public department responsible for the transportation and delivery of the mails.
• noun A local office where mail is received, sorted, and delivered, and where stamps and other postal materials are sold.
• noun A game in which kisses are exchanged for pretended letters.

from The Century Dictionary.

• noun An office or place where letters are received for transmission to various destinations, and from which letters are delivered that have been received from places at home and abroad. Abbreviated P. O.
• noun A department of the government charged with the conveyance of letters, etc., by post.

from the GNU version of the Collaborative International Dictionary of English.

• noun See under 4th post.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A place (building, office, shop, or counter) concerned with the business of delivering letters, post or mail and selling stamps, etc.
• noun An organisation that delivers letters (for example, Canada Post, Royal Mail, United States Postal Service).
• noun North America A children's game.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a local branch where postal services are available
• noun a children's game in which kisses are exchanged for pretended letters
• noun an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States