- (v.t.) To multiply by four; to increase fourfold; to double; to double twice.
- (v.i.) To be multiplied by four; to increase fourfold; to become four times as much.
- (n.) four times the sum or number; a fourfold amount; as, to receive to quadruple of the amount in damages.
- (a.) Fourfold; as, to make quadruple restitution; a quadruple alliance.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). quadruple. Retrieved September 22, 2026, from http://smartdefine.org/quadruple/definitions/2051603 |
| Chicago | Webster's. 2011. "quadruple" http://smartdefine.org/quadruple/definitions/2051603 (accessed September 22, 2026). |
| Harvard | Webster's 2011, quadruple, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/quadruple/definitions/2051603>. |
| MLA | Webster's. "quadruple" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/quadruple/definitions/2051603> |