sedecuple /ˌsiːdɛˈkjuːp(ə)l/adjective 4verb 1forms 3 adjective4 •(rare) Sixteenfold. •(rare) Sixteen times as great or as numerous.If for duple we had substituted triple, quadruple, quintuple, &c. the action would have come out noncuple, sedecuple, 25ple. — 1744 •(rare) Sixteen-to-one.As an example, let us take a ratio which is two-thirds of a quadruple. Since 2 is the numerator, we shall have one-third of a quadruple ratio squared, namely a sedecuple ratio. — 1965 •(rare) Comprising sixteen repeated elements. verb1 •(rare) To increase by a factor of sixteen. formssedecupled · sedecupling · sedecuples