) Fourfold; as, to make quadruple restitution; a quadruple alliance. Quadruple (n.) four times the sum or number; a fourfold amount; as, to receive to quadruple of the amount in damages. Quadrupled (imp. & p. p.) of Quadruple Quadrupling (p. pr. & vb. n.) of Quadruple Quadruple ...