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The definition of envelope
8 Definitions of: envelope
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- noun, a flat covering of paper, usually rectangular in shape and with a flap that can be folded over and sealed, used to enclose a letter, etc
- noun, any covering or wrapper
- noun, biology any enclosing structure, such as a membrane, shell, or skin
- noun, the bag enclosing the gas in a balloon
- noun, maths a curve or surface that is tangent to each one of a group of curves or surfaces
- noun, electronics the sealed glass or metal housing of a valve, electric light, etc
- noun, telecomm the outer shape of a modulated wave, formed by the peaks of successive cycles of the carrier wave
- noun, push the envelope to push the boundaries of what is possible
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From Collins
©HarperCollins 2008. Collins English Dictionary definition of envelope