keiretsu Syllabification: (kei·ret·su)Pronunciation: /kāˈretso͞o/Definition of keiretsu noun (plural same) (in Japan) a conglomeration of businesses linked together by cross-shareholdings to form a robust corporate structure. Origin:Japanese, from kei 'systems' + retsu 'tier'keiretsu in other Oxford dictionaries Definition of keiretsu in the British & World English dictionary