Word:

Envelope

En´vel`ope
n.1.That which envelops, wraps up, encases, or surrounds; a wrapper; an inclosing cover; esp., the cover or wrapper of a document, as of a letter.
2.(Astron.) The nebulous covering of the head or nucleus of a comet; - called also coma.
3.(Fort.) A work of earth, in the form of a single parapet or of a small rampart. It is sometimes raised in the ditch and sometimes beyond it.
4.(Geom.) A curve or surface which is tangent to each member of a system of curves or surfaces, the form and position of the members of the system being allowed to vary according to some continuous law. Thus, any curve is the envelope of its tangents.
4.A set of limits for the performance capabilities of some type of machine, originally used to refer to aircraft; - it is often described graphically as a two-dimensional graph of a function showing the maximum of one performance variable as a function of another. Now it is also used metaphorically to refer to capabilities of any system in general, including human organizations, esp. in the phrase push the envelope. It is used to refer to the maximum performance available at the current state of the technology, and therefore refers to a class of machines in general, not a specific machine.
push the envelope
to increase the capability of some type of machine or system; - usually by technological development.
Noun1.envelope - a flat rectangular paper container for papers
2.envelope - any wrapper or covering
3.envelope - a curve that is tangent to each of a family of curves
4.envelope - a natural covering (as by a fluid); "the spacecraft detected an envelope of gas around the comet"
5.envelope - the maximum operating capability of a system; "test pilots try to push the envelope"
6.envelope - the bag containing the gas in a balloon
Synonyms: gasbag
aura, bandage, bandaging, binder, binding, blaze of glory, border, brilliance, brilliancy, charisma, circumference, cortex, covering, crust, dust jacket, envelopment, epidermis, exterior, external, facade, face, facet, fringe, front, gift wrapping, glamour, glory, halo, illustriousness, integument, jacket, lineaments, luster, magic, mystique, nimbus, numinousness, outer face, outer layer, outer side, outer skin, outline, outside, periphery, radiance, resplendence, resplendency, rind, shell, skin, splendor, superficies, superstratum, surface, top, wrap, wrapper, wrapping
Browse
Enumeration
Enumerative
Enumerator
Enunciable
Enunciate
Enunciation
Enunciative
Enunciator
Enunciatory
Enure
enured
Enuresis
Envassal
Envault
Enveigle
Envelop
-- Envelope --
enveloped
enveloping
Envelopment
Envenime
Envenom
Envermeil
Enviable
enviably
Envie
Envier
Envigor
Envious
enviously
enviousness
Environ
Environment
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