decuple UK /dɛˈkjuːp(ə)l/US /dɛˈkjʊp(ə)l/adjective 1noun 1verb 1forms 3 adjective1 •Tenfold. noun1 •An amount multiplied by ten.The gold coin of the law of 1818 is of four denominations; the decuple of 30 ducats, the half-decuple, ... — 1842 verb1 •To multiply by ten.The multiplications on this fragment show four of the basic techniques used by the Egyptian scribe in performing calculations: doubling, halving, decupling, and "taking two-thirds". — 2004 formsdecupled · decupling · decuples