1. post office, local post office, branch, subdivision, arm
usage: a local branch where postal services are available"
2. United States Post Office, US Post Office, Post Office, PO, independent agency
usage: an independent agency of the federal government responsible for mail delivery (and sometimes telecommunications) between individuals and businesses in the United States
3. post office, child's game
usage: a children's game in which kisses are exchanged for pretended letters