"More Triennial" refers to something that occurs every three years, but there are other ways to express this frequency. Some synonyms for "more triennial" include "triennium," "every third year," "three-yearly," "triquennial," "thrice-yearly," and "once in three years." Each of these expressions describes a period of time that occurs every three years or is related to a three-year cycle. For example, "triquennial" refers to something that occurs every three years, while "thrice-yearly" relates to an event that happens three times a year. By using these synonyms, you can add variety to your writing and convey the frequency of events in a more interesting way.