noun
[ U ] a system of buying and selling goods through the mail :
All our products are available by mail order.
a mail-order company
a mail-order catalogue
noun
[ U ] a system of buying and selling goods through the mail :
All our products are available by mail order.
a mail-order company
a mail-order catalogue
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005