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