A really fast thesaurus... with lots of synonyms.
We don't have synonyms for triennially yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are triennial, biennially and triennials.
We don't have any synonyms for triennially yet.
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Think triennially belongs in the thesaurus? Recommend it and we'll take a look.