triennial

1. a. Continuing three years; as, triennial parliaments; a triennial reign. Source: opted

2. a. Happening, coming about, or appearing once in every three years; as, triennial elections; a triennial catalogue; a triennial visitation. Source: opted

3. n. Something which takes place or appears once in three years. Source: opted

4. adj. occurring every third year or lasting 3 years Source: wordnet

5. n. the 300th anniversary (or the celebration of it) Source: wordnet

6. 1. Continuing three years; as, triennial parliaments; a triennial reign. Howell. 2. Happening, coming about, or appearing once in every three years; as, triennial elections; a triennial catalogue; a triennial visitation. T. Warton. Something which takes place or appears once in three years. Source: webster

7. Something which takes place or appears once in three years. Source: adambom

8. j:100 s. occurring every third year or lasting 3 years Source: ecdict

Thesaurus links