envelope   (Sound)

The noun envelope has 6 senses

• envelope -- (a flat (usually rectangular) container for a letter, thin package, etc.)


• envelope -- (any wrapper or covering)


• envelope -- (a curve that is tangent to each of a family of curves)


• envelope -- (a natural covering (as by a fluid); "the spacecraft detected an envelope of gas around the comet")


• envelope -- (the maximum operating capability of a system (especially an aircraft); "test pilots try to push the envelope")


• envelope, gasbag -- (the bag containing the gas in a balloon)