post-office box post-office address • post-office box number · · · Info · Definitions · Characters · · post-office box · · Text Common · · Latin · · Scripts 15 · · Length 4 · · Syllables Definitions · · · (noun) a numbered compartment in a post office where mail is put to be called for. Synonyms: Post-Office box, PO Box, POB, call box, letter box. · · Noun Definition 1 Characters · · space U+0020 - hyphen-minus U+002D b latin small letter b U+0062 c latin small letter c U+0063 e latin small letter e U+0065 f latin small letter f U+0066 i latin small letter i U+0069 o latin small letter o U+006F p latin small letter p U+0070 s latin small letter s U+0073 t latin small letter t U+0074 x latin small letter x U+0078