In mathematical terminology, multiplying a quantity or number by 11 is formally referred to as hendecadruple or an elevenfold multiplication. While Latin-derived numerical multipliers like double (2), triple (3), quadruple (4), and quintuple (5) are common in everyday language, higher multiples like 11 times are almost always expressed analytically in plain English as "11 times" or "eleven times" to maintain immediate clarity.
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