From Longman Dictionary of Contemporary Englishextranetex‧tra‧net /ˈekstrənet/ noun [countable] a computer system in a company that allows better communication between the company and its customers by combining Internet and intranet systems, so that some customers can view some of the company’s private information that is not normally available on the InternetFrom Longman Business Dictionaryextranetex‧tra‧net /ˈekstrənet/ noun [countable]COMPUTING a computer system that allows better communication between a company and its customers by combining Internet and intranet systems, so that some customers can view some of the company’s private information that is not normally available on the Internet