Dictionary & Thesaurus

envelope

1.	(noun) any wrapper or covering
	Related Words: wrap, wrapper, wrapping

2.	(noun) a flat rectangular paper container for papers
	Related Words: container, window envelope

3.	(noun) the bag containing the gas in a balloon
	Synonyms: gasbag
	Related Words: bag

4.	(noun) the maximum operating capability of a system; "test pilots try to push the envelope"
	Related Words: operating capability, performance capability

5.	(noun) a natural covering (as by a fluid); "the spacecraft detected an envelope of gas around the comet"
	Related Words: cover, covering, natural covering

6.	(noun) a curve that is tangent to each of a family of curves
	Related Words: curve, curved shape