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triennially

Adverb

Meaning

Once in three years.

Source: Webster's dictionary

Synonyms

biennially every three years every other year every sixth year every fifth year every third year subsequently every fourth year every third year thereafter every three-year event every three-year happening every three-year instance every three-year interval every second or third year every three-year occasion every three years thereafter
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Close letter words and terms

trielemental triene triennial triennium trienoic triens