Sentence:  “The <WSD>post-office</WSD>is a wonderful establishment!” said she.—“The regularity and despatch of it! If one thinks of all that it has to do, and all that it does so well, it is really astonishing!” 
Meaning of the word marked with <WSD> tags:  An organisation that delivers letters (for example, Canada Post, Royal Mail, United States Postal Service).