a. [ L. triennium the space of three years; tri- (see Tri-) + annus year. See Annual. ] 1. Continuing three years; as, triennial parliaments; a triennial reign. Howell. [ 1913 Webster ]
2. Happening, coming about, or appearing once in every three years; as, triennial elections; a triennial catalogue; a triennial visitation. T. Warton. [ 1913 Webster ]
n. [ L. trierarchus, Gr. &unr_;; &unr_; a trireme + &unr_; a leader, a chief. ] (Gr. Antiq.) (a) The commander of a trireme. (b) At Athens, one who (singly, or jointly with other citizens) had to fit out a trireme for the public service. [ 1913 Webster ]
a. [ L. trietericus, Gr. &unr_;, fr. &unr_; (sc. &unr_;) a triennial festival; &unr_; (see Tri-.) + &unr_; a year. ] Kept or occurring once in three years; triennial. [ R. ] J. Gregory. [ 1913 Webster ]
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เช่น Secretary of State=รัฐมนตรีต่างประเทศของสหรัฐฯ (ในภาพตัวอย่าง),
High school=โรงเรียนมัธยมปลาย