We found one dictionary that defines the word quinquavigesimal:

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1. quinquavigesimal: Wiktionary

Definitions from Wiktionary (quinquavigesimal) ▸ adjective:  Based upon the number twenty-five ▸ Words similar to quinquavigesimal ▸ Usage examples for quinquavigesimal ▸ Idioms related to quinquavigesimal ▸ Wikipedia articles (New!) ▸ Popular nouns described by quinquavigesimal ▸ Words that often appear near quinquavigesimal ▸ Rhymes of quinquavigesimal ▸ Invented words related to quinquavigesimal