triad

1. N-COUNT The Triads were Chinese secret societies in old China that were often associated with organized crime. 三郃會; 舊中國的秘密犯罪組織[usu pl, oft N n]

2. N-COUNT A triad is a group of three similar things. 三個一組[正式] [oft N 'of' n]

For the faculty, there exists the triad of responsibilities: teaching, research, and service. 教員要承擔三項責任:教學、研究和服務。