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Dictionary definition for: Envelope
1. (n) a flat rectangular paper container for papers
2. (n) any wrapper or covering
3. (n) a curve that is tangent to each of a family of curves
4. (n) a natural covering (as by a fluid) "the spacecraft detected an envelope of gas around the comet"
5. (n) the maximum operating capability of a system; "test pilots try to push the envelope"
WordNet 2.1 Copyright Princeton University. All rights reserved.