Yes, the formal mathematical term for multiplying a quantity by 9 is nonuple (or nonupled), derived from Latin roots. Other related Latin-derived numerical multipliers include single (1), double (2), triple (3), quadruple (4), quintuple (5), sextuple (6), septuple (7), octuple (8), and decuple (10), though standard conversational English typically prefers the phrase "nine times."
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