1. (

• quadruple ,
• fourfold ,
• four-fold ,

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

2. (

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

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

1. (

• fourfold ,
• four_times

) by a factor of four; "the price of gasoline has increased fourfold over the past two years" ;