envelope
nouns
a flat (usually rectangular) container for a letter, thin package, etc.
is a type of (narrower)
any object that can be used to hold things (especially a large metal boxlike object of standardized dimensions that can be loaded from one form of transport to another)
any wrapper or covering
a curve that is tangent to each of a family of curves
a natural covering (as by a fluid)
"the spacecraft detected an envelope of gas around the comet"
is a type of (narrower)
a natural object that covers or envelops
"under a covering of dust"; "the fox was flushed from its cover"
the maximum operating capability of a system (especially an aircraft)
"test pilots try to push the envelope"
is a type of (narrower)
the capability of a technological system to perform as intended
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