a. [ L. tricennium thirty years; triginta thirty + annus year: cf. L. tricennalis. ] Of or pertaining to thirty years; consisting of thirty years; occurring once in every thirty years. [ 1913 Webster ]
a. [ L. triennium the space of three years; tri- (see Tri-) + annus year. See Annual. ]
n. Something which takes place or appears once in three years. [ 1913 Webster ]
adv. Once in three years. [ 1913 Webster ]
a. [ L. triennium the space of three years; tri- (see Tri-) + annus year. See Annual. ]
n. Something which takes place or appears once in three years. [ 1913 Webster ]
adv. Once in three years. [ 1913 Webster ]