Fourfold; four times told.n. A number, sum, etc., four times as great as that taken as the standard: as, to receive the quadruple of a given sum.To make four times as much or as many; multiply by four; repeat four times; make, do, or cause to happen four times over.To become four times as much or as many; repeat itself four times.Consisting of four parts; completed in four separate or successive operations.