Definition of "quadrilogy" []

• A tetralogy. (noun)

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• "This repost completes Creams available studio "quadrilogy" on AvaxHome:"
• "Rarely is this truer than in Kay Kenyon's science fiction/fantasy hybrid quadrilogy."
• "Either way, I've been talking up Kay's not-a-trilogy-but-a-quadrilogy as some of the more original and interesting SF out there."