[kwo-droo-puh
l, -druhp-uhl, kwod-roo-puhl] 
adjective, noun, verb, -pled, -pling.| 1. | fourfold; consisting of four parts: a quadruple alliance. |
| 2. | four times as great. |
| 3. | Music. having four beats to a measure. |
| 4. | a number, amount, etc., four times as great as another. |
| 5. | something, as a series of acrobatic somersaults, made up of four clearly defined parts or stages: the first trapeze artist to perform a quadruple successfully. |
| 6. | to make or become four times as great: To serve 24 people, quadruple the recipe. My savings quadrupled in 20 years. |
| quad·ru·ple (kwŏ-drōō'pəl, -drŭp'əl, kwŏd'rŏŏ-pəl) adj.
tr. & intr.v. quad·ru·pled, quad·ru·pling, quad·ru·ples To multiply or be multiplied by four: quadrupled the order; quadrupled in size. [From Middle English quadriple, fourfold amount, and quadruple, tooth with four roots, both from Old French quadruple, from Latin quadruplum, from neuter of quadruplus, fourfold : quadru-, quadri-, quadri- + -plus, -fold; see pel-2 in Indo-European roots.] quad·ru'ply adv. |