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en·ve·lope  (ĕn′və-lōp′, ŏn′-)n.1. A flat paper container, especially for a letter, usually having a gummed flap.2. Something that envelops; a wrapping.3. Biology An enclosing structure or cover, such as a membrane or the outer coat of a virus.4. The bag containing the gas in a balloon or airship.5. The set of limitations within which a technological system, especially an aircraft, can perform safely and effectively.6. Astronomy a. A usually spherical region of interstellar matter surrounding a forming star and interacting with the star's gravitational and radiation fields.b. The coma of a comet.7. Mathematics A curve or surface that is tangent to every one of a family of curves or surfaces.Idiom: push the envelope To exceed or try to exceed the existing limits of a discipline or activity.[French enveloppe, from envelopper, to envelop, from Old French envoloper; see envelop.]Usage Note: Some people dislike the pronunciation (ŏn′və-lōp′), arguing that it is pretentious for being pseudo-French and that it is unnecessary, since there exists a perfectly acceptable Anglicized pronunciation, (ĕn′və-lōp′). In our 1992 survey, however, the (ŏn′-) pronunciation was used exclusively by 30 percent of the U