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• s  having four units or components
• s  four times as great or many

• Throughout the world, Volberg says, the introduction of gambling typically results in a three- to four-fold increase in addiction rates within the first five years.
• Be it patriotism or the easier path to citizenship, the number of immigrants serving in the military has surged four-fold since 911, and is now about 2% of the force.
• Rumsfeld promises a relentless carpet-bomb barrage and a four-fold increase in the number of special-ops troops on the ground inside Afghanistan.

• quadruple
• quadruplicate
• quadruplex
• fourfold

News & Articles

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• Prostate cancer treatment tied to hernia risk
  By Kerry Grens NEW YORK (Reuters Health) - Prostate removal or radiation therapy to treat cancer is tied to two- to four-fold higher than usual risk of later having a hernia repaired, according to a new study. It's not clear why hernia repairs are more common among these men. There might be tissue damage caused by the cancer treatment, or perhaps doctors are finding hernias that might otherwise ...
  June 19, 2013 - Reuters via Yahoo! News

Quotes

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• Penny Wong in Bloomberg
  In the last five years, India's total trade with the GCC countries has risen more than four-fold from $5.55 billion in 2000-01 to $23.42 billion in 2005-06. The period witnessed buoyancy in exports and imports. Signing of the Framework Agreement on... Kamal Nath http://www.google.com/url?q=http://en.wikipedia.org/wiki/Kamal_Nath&source=dictionary&usg=AFQjCNFe2tVB2i1VPR3rksRNLS9uNCjm7w Middle East North Africa Financial Network http://www.google.com/url?q=http://www.menafn.com/qn_news_story_s.asp%3Fstoryid%3D1093155334&source=dictionary&usg=AFQjCNEKE5NLfPL9avN5O4fv43iwTGtyiw Jun 4, 2007 39509 50743 four-fold This will be the largest increase in renewables in the nation's history," Climate Change Minister Penny Wong told parliament in Canberra today. "We will see a four-fold increase in renewable energy by 2020."
• Sunil Dutt in Business Standard
  At present, we have over 100 exclusive franchise outlets selling Samsung mobile phones and intend to increase it by four-fold in 2008. The way we are progressing, we are moving forward towards the target,Samsung India Electronics Pvt Ltd...