United States Postal Service

The United States Postal Service (USPS) is an independent establishment of the executive branch of the United States government (see ) responsible for providing postal service in the U.S. Within the United States, it is colloquially referred to simply as "the post office."
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Noun
1. an independent federal agency that provides mail processing and delivery service for individuals and businesses in the United States
(synonym) US Postal Service, USPS
(hypernym) independent agency
(part-meronym) United States Postal Inspection Service, US Postal Inspection Service