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• n  a flat (usually rectangular) container for a letter, thin package, etc.
• n  any wrapper or covering
• n  a curve that is tangent to each of a family of curves
• n  a natural covering (as by a fluid)
  the spacecraft detected an envelope of gas around the comet
• n  the maximum operating capability of a system (especially an aircraft)
  test pilots try to push the envelope
• n  the bag containing the gas in a balloon

• An envelope hand-addressed by jailed Panamanian General Manuel Noriega is $350.
• Some nonprofits have replaced the old model, in which a paid manager had volunteers stuffing envelopes, with a volunteer manager who has paid help to handle mail.
• When Chambers arrived, he reminded Levine of the envelope.

• gasbag

News & Articles

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• Envelope Maker Filing for Bankruptcy Protection
  Frisco based ‘National Envelope’ says it’s filing for bankruptcy protection. The company is the largest private envelope maker in the US. …
  June 12, 2013 - Nightcap TV
• Envelope Maker Filing for Bankruptcy Protection
  Frisco based ‘National Envelope’ says it’s filing for bankruptcy protection. The company is the largest private envelope maker in the US. …
  June 12, 2013 - Nightcap TV
• National Envelope Hopes To Lick Bankruptcy Filing
  National Envelope, the largest privately-held manufacturer of envelopes in the U.S., has filed for bankruptcy protection. It's a sign of the paperless, digital times. It previously filed for Chapter 11 protection in 2010.
  June 11, 2013 - NPR

Quotes

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• John Battelle in International Herald Tribune
  Google will keep pushing the envelope,predicted John Battelle, who wrote a book about the company and now runs Federated Media, a conduit for Internet publishers and advertisers. "It's one of the things that seems to make them happy."
• Jimmie Johnson in Washington Post
  Every lap. Every lap I was concerned about it. Every corner, for that matter,Johnson said. "As a group, we all knew we couldn't push the envelope. I knew at the end, a seven-lap shootout, I could blast it off in there and I'd be OK."
• Elkhonon Goldberg in FOX News
  These techniques are used usually in clinical contexts. The gaming companies are trying to push the envelope,said Goldberg, author of "The Wisdom Paradox: How Your Mind Can Grow Stronger As Your Brain Grows Older." "You can use...