1. (

• quadruple

) increase fourfold; "His stock earning quadrupled" ;

1. (

• quadruple ,
• quadruplicate ,
• quadruplex ,
• fourfold ,
• four-fold

) having four units or components; "quadruple rhythm has four beats per measure"; "quadruplex wire" ;

2. (

• quadruple ,
• fourfold ,
• four-fold ,

) four times as great or many; "a fourfold increase in the dosage" ;