Tenfold in amount or to multiply something by ten.
From Latin 'decuplus' (tenfold), combining 'decem' (ten) and '-plus' (fold). The word entered English in the 16th century to describe multiplication by ten.
Decuple is part of a family of multiplication words—double (2x), triple (3x), quadruple (4x)—but we rarely use decuple in everyday speech, which is why 'ten times' sounds more natural to modern ears.
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