Oxford Dictionary English postcode noun noun BrE BrE//ˈpəʊstkəʊd// ; NAmE NAmE//ˈpoʊstkoʊd// (British English) (also postal code (British English, Canadian English)) Add to my wordlistjump to other resultsa group of letters and numbers that are used as part of an address so that post/mail can be separated into groups and delivered more quickly Her postcode is CB11 3AD see also zip codeCheck pronunciation: postcode oxfordlearnersdictionaries.com