| envelope | (noun) any wrapper or covering | - |
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| (noun) a flat (usually rectangular) container for a letter, thin package, etc. | - |
| (noun) the bag containing the gas in a balloon | Synonyms: gasbag |
| (noun) the maximum operating capability of a system (especially an aircraft) | - |
| (noun) a natural covering (as by a fluid) | - |
| (noun) a curve that is tangent to each of a family of curves | - |
| envelopment | (noun) the act of enclosing something inside something else | Synonyms: enclosing, enclosure, inclosure |
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| enviousness | (noun) a feeling of grudging admiration and desire to have something that is possessed by another | Synonyms: envy |
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| environment | (noun) the area in which something exists or lives | Synonyms: environs, surround, surroundings |
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| (noun) the totality of surrounding conditions | - |
| environmentalism | (noun) the activity of protecting the environment from pollution or destruction | - |
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| (noun) the philosophical doctrine that environment is more important than heredity in determining intellectual growth | - |
| environmentalist | (noun) someone who works to protect the environment from destruction or pollution | Synonyms: conservationist |
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| environs | (noun) the area in which something exists or lives | Synonyms: environment, surround, surroundings |
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| (noun) an outer adjacent area of any place | Synonyms: purlieu |
| envisioning | (noun) visual imagery | Synonyms: picturing |
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| envoi | (noun) a brief stanza concluding certain forms of poetry | Synonyms: envoy |
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| envoy | (noun) a brief stanza concluding certain forms of poetry | Synonyms: envoi |
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| (noun) a diplomat having less authority than an ambassador | Synonyms: envoy extraordinary, minister plenipotentiary |
| (noun) someone sent on a mission to represent the interests of someone else | Synonyms: emissary |
| envy | (noun) spite and resentment at seeing the success of another (personified as one of the deadly sins) | Synonyms: invidia |
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| (noun) a feeling of grudging admiration and desire to have something that is possessed by another | Synonyms: enviousness |