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English definition of “quadruple”

quadruple

verb [I or T] uk   /kwɒdˈruː.pl̩/ us    /kwɑːˈdruː-/
to become four times as big, or to multiply a number or amount by four: The number of students at the college has quadrupled in the last ten years. We expect to quadruple our profits this year.

quadruple

adjective, predeterminer uk   /ˈkwɒd.rʊp.l̩/ us    /kwɑːˈdruː.pl̩/
four times as big: a quadruple measure We have had quadruple the number of applicants we expected. involving four parts, people, places, etc.: a quadruple fracture of his thumb
(Definition of quadruple from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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