Found 2 items, similar to Triennially.
English → English (WordNet) Definition: triennial triennial adj : occurring every third year or lasting 3 years n : the 300th anniversary (or the celebration of it) [syn: tercentennial, tercentenary]
English → English (gcide) Definition: Triennially Triennially \Tri*en"ni*al*ly\, adv. Once in three years. [1913 Webster]