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post-office box

noun
1.
(in a post office) a locked compartment into which the mail of a box renter is put to be called for.
Abbreviation: POB, P.O.B.
Origin
1825-1835
1825-35, Americanism
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for post office box

post office box

noun
1.
a private numbered place in a post office, in which letters received are kept until called for
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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