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an address consisting of the number of a PO Box (=an address you use instead of your real address)
post office box: used in an address showing the number of a small box at a post office where mail for you can be sent
American a series of numbers added to your address to make it easier to deliver letters to you. The British word is postcode.
the situation of the United Kingdom leaving the European UnionBuzzWord Article
a rise in the level of a stream or riveradd a word