Definition of post office noun from the Oxford Advanced American Dictionary

      

    post office

     noun
    noun
     
     
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  1. 1 [countable] a place where you can buy stamps, mail letters, etc. Where's the main post office? You can buy your stamps at the post office. a post office counter
  2. 2 the Post Office [singular] (abbreviation PO) the national organization in many countries that is responsible for collecting and delivering mail He works for the Post Office.
  3. 3[uncountable] a children's game in which imaginary letters are exchanged for kisses
See the Oxford Advanced Learner's Dictionary entry: post office