We found one dictionary that defines the word septuplication:

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1. septuplication: Wiktionary

Definitions from Wiktionary (septuplication) ▸ noun:  multiplication by seven ▸ Words similar to septuplication ▸ Usage examples for septuplication ▸ Idioms related to septuplication ▸ Wikipedia articles (New!) ▸ Popular adjectives describing septuplication ▸ Words that often appear near septuplication ▸ Rhymes of septuplication ▸ Invented words related to septuplication