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Definition of quadruple: 1. four times the sum or number; a fourfold amount; as, to receive to quadruple of the amount in damages.
2. Fourfold; as, to make quadruple restitution; a quadruple alliance.
3. To be multiplied by four; to increase fourfold; to become four times as much.
4. To multiply by four; to increase fourfold; to double; to double twice.

Synonyms:

common factor, multiple, four-ply, assess, base, four-fold, graduated, gathering, quadruplet, compute, coefficient, accumulative, down, project, cube root, quartet, quatern, quaternity, foursome, quad, quartette, exponential, arithmetic progression, estimate, add up, cube, four times as great, prove, quadripartite, Arabic numeral, declining, four-part, biquadratic, reckon, tetrad, computation, calculate, quaternary, count, growing, four-cycle, four-way, quaternion, four times as many, constant, quadruplex, depleted, common multiple, four, determine

quadruplication

fourfold, quadruplicate