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 ]
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 ]