Oxford Dictionary English mail order noun noun BrE BrE//ˈmeɪl ɔːdə(r)// ; NAmE NAmE//ˈmeɪl ɔːrdər// [uncountable] Add to my wordlistjump to other resultsa system of buying and selling goods through the mail All our products are available by mail order. a mail-order company a mail-order catalogueSee mail order in the Oxford Advanced American DictionaryCheck pronunciation: mail order oxfordlearnersdictionaries.com