From Longman Business Dictionaryjust-in-time systemˌjust-in-ˈtime ˌsystem [countable usually singular]COMMERCE a system in which goods are produced or bought just before they are needed, reducing the costs to the firm of keeping the goods for a long period of timeFor the just-in-time system to function, all of the parts that are made and supplied must meet predetermined quality standards. → system