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• s  four times as great or many
  a fourfold increase in the dosage
• s  having four units or components
• r  by a factor of four
  the price of gasoline has increased fourfold over the past two years

• By 2011, assets under management at SWFs worldwide are projected to grow almost fourfold to nearly $8 trillion, according to Merrill Lynch.
• Shipments of FDA-regulated goods from China have jumped fourfold over the past decade, according to the Congressional Research Service.
• The latest such case is abruptly raising natural gas prices fourfold for Ukraine.

• quadruple
• four-fold
• quadruplicate
• quadruplex
• four times

News & Articles

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• Shinsei Bank to Quadruple Project Financing Loans in Three Years
  Shinsei Bank Ltd. (8303) plans to increase project financing fourfold in the next three years to take advantage of higher spreads for infrastructure loans and reduce reliance on regular corporate lending amid rising competition.
  June 13, 2013 - Bloomberg

Quotes

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• Kevin Rudd in The Australian
  According to dental health experts, there is a fourfold increase in dental decay between 12 and 21 years of age, and almost half of all teenagers have some signs of gum disease,Mr Rudd said. "Tooth decay ranks as Australia's most prevalent...
• Jack Reed in New York Times
  The administration appears to have made a very costly decision that has resulted in a fourfold increase in the nuclear weapons of North Korea,Senator Reed said in an interview on Wednesday. "If that was based in part on mixing up North...
• Scott McClellan in FOXNews
  In fact this administration proposed a fourfold increase in fines and penalties for violations of the Mine Safety and Health Administration rules,White House press secretary Scott McClellan said.