| Word | Definitions | Synonyms |
|---|---|---|
| envelope | (noun) any wrapper or covering | - |
| (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 |