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English to English noun
| 1 |
a flat (usually rectangular) container for a letter, thin package, etc. |  | source: wordnet30
| 2 |
any wrapper or covering | | source: wordnet30
| 3 |
a curve that is tangent to each of a family of curves | | source: wordnet30
| 4 |
a natural covering (as by a fluid) | | Example: the spacecraft detected an envelope of gas around the comet
source: wordnet30
| 5 |
the maximum operating capability of a system (especially an aircraft) | | Example: test pilots try to push the envelope
source: wordnet30
| 6 |
the bag containing the gas in a balloon | | source: wordnet30
| 7 |
That which envelops, wraps up, encases, or surrounds; a wrapper; an inclosing cover; esp., the cover or wrapper of a document, as of a letter. | | source: webster1913
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