post office

noun
  1. A public department or corporation responsible for mail services, including the collection, sorting, and delivery of letters and parcels. noun
    I need to go to the post office to send this package.
    The post office was closed on the public holiday.
  2. A building or room where mail is received, sorted, and sent out, and where postal services are provided to the public. noun
    There's a post office at the corner of Main Street and Elm Avenue.
    She works at the local post office as a clerk.