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1. Increase fourfold
   "His stock earning quadrupled"

1. A set of four similar things considered as a unit
   - quartet, quartette, quadruplet
    
2. A quantity that is four times as great as another

1. Having four units or components
   "quadruple rhythm has four beats per measure"
   - quadruplicate, quadruplex, fourfold, four-fold
    
2. Four times as great or many
   - fourfold, four-fold

Derived forms: quadrupled, quadruples, quadrupling

See also: multiple, quadruplicate, quadrupling

Type of: manifold, multiple, multiply, set

Encyclopedia: Quadruple