DECUPLE Meaning of DECUPLE in English [dec.u.ple] adj [F decuple, fr. MF, fr. LL decuplus, fr. L decem ten + -uplus (as in quadruplus quadruple)] (1613) 1: tenfold 2: taken in groups of 10. Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012