PO
1. a noncommissioned officer in the Navy or Coast Guard with a rank comparable to sergeant in the Army • Syn: petty officer, P.O. • Hypernyms: noncommissioned officer, noncom, enlisted officer • Hyponyms: master-at-arms, senior chief petty officer, SCPO 2. an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States • Syn: United States Post Office, US Post Office, Post Office • Hypernyms: independent agency
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