| envelope | | |
| n. (artifact) | 1. envelope | a flat (usually rectangular) container for a letter, thin package, etc.. |
| ~ container | any object that can be used to hold things (especially a large metal boxlike object of standardized dimensions that can be loaded from one form of transport to another). |
| ~ window envelope | an envelope with a transparent panel that reveals the address on the enclosure. |
| n. (artifact) | 2. envelope | any wrapper or covering. |
| ~ wrapping, wrapper, wrap | the covering (usually paper or cellophane) in which something is wrapped. |
| n. (shape) | 3. envelope | a curve that is tangent to each of a family of curves. |
| ~ curve, curved shape | the trace of a point whose direction of motion changes. |
| n. (object) | 4. envelope | a natural covering (as by a fluid).; "the spacecraft detected an envelope of gas around the comet" |
| ~ covering, natural covering, cover | a natural object that covers or envelops.; "under a covering of dust"; "the fox was flushed from its cover" |
| n. (attribute) | 5. envelope | the maximum operating capability of a system (especially an aircraft).; "test pilots try to push the envelope" |
| ~ operating capability, performance capability | the capability of a technological system to perform as intended. |
| n. (artifact) | 6. envelope, gasbag | the bag containing the gas in a balloon. |
| ~ bag | a flexible container with a single opening.; "he stuffed his laundry into a large bag" |
| ~ balloon | large tough nonrigid bag filled with gas or heated air. |
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