Envelope vs. Nebulous

A flat paper container, especially for a letter, usually having a gummed flap.

Cloudy, misty, or hazy.

Something that envelops; a wrapping.

Lacking definite form or limits; vague

(Biology) An enclosing structure or cover, such as a membrane or the outer coat of a virus.

Of, relating to, or characteristic of a nebula.

The bag containing the gas in a balloon or airship.

In the form of a cloud or haze; hazy.

The set of limitations within which a technological system, especially an aircraft, can perform safely and effectively.

Vague or ill-defined.

A usually spherical region of interstellar matter surrounding a forming star and interacting with the star's gravitational and radiation fields.

Relating to a nebula or nebulae.

The coma of a comet.

Cloudy; hazy; misty.

(Mathematics) A curve or surface that is tangent to every one of a family of curves or surfaces.

Of, pertaining to, or having the appearance of, a nebula; nebular; cloudlike.

A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing.

Lacking definite form or limits;

Something that envelops; a wrapping.

Lacking definition or definite content;

A bag containing the lifting gas of a balloon or airship; fabric that encloses the gas-bags of an airship.

(geometry) A mathematical curve, surface, or higher-dimensional object that is the tangent to a given family of lines, curves, surfaces, or higher-dimensional objects. Category:en:Curves

(electronics) A curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave in electronics.

(music) The shape of a sound, which may be controlled by a synthesizer or sampler.

(computing) The information used for routing a message that is transmitted with the message but not part of its contents.

(biology) An enclosing structure or cover, such as a membrane; a space between two membranes

(engineering) The set of limitations within which a technological system can perform safely and effectively.

(astronomy) The nebulous covering of the head or nucleus of a comet; a coma.

An earthwork in the form of a single parapet or a small rampart, sometimes raised in the ditch and sometimes beyond it.

Archaic form of envelop

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.

The nebulous covering of the head or nucleus of a comet; - called also coma.

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.

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.

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.

A flat rectangular paper container for papers

Any wrapper or covering

A curve that is tangent to each of a family of curves

A natural covering (as by a fluid);

The maximum operating capability of a system;

The bag containing the gas in a balloon