n. ~ 1. An enclosure for a flat or folded document, especially one used for sending mail. - 2. A digital entity used for sending electronic mail or messages, consisting of a header for addressing and [..]

"a wrapper, an enclosing cover," specifically a prepared wrapper for a letter or other paper, 1705, from French enveloppe (13c.), a back-formation from envelopper "to envelop" (see [..]

material found in a roughly spherical shape around a star.

Rectangular, flat container made of flexible material that is folded to produce overlapping seams that are adhered together on two or three edges; often with a flag closure, and intended for small obj [..]

a flat (usually rectangular) container for a letter, thin package, etc. any wrapper or covering a curve that is tangent to each of a family of curves a natural covering (as by a fluid); " [..]

The outermost points traced out by a moving curve.

a folded piece of paper in which you put letters for posting

The boundary of the family of curves obtained by varying a parameter of a wave. See figure under amplitude modulation.

outer protective bulb or jacket of a lamp.

Definition Set of two moving averages that mark the upper and lower limits of the trading price range of a commodity, currency, or security for a particular trade or trader. These averages are plotted [..]

Accoustics. The slowly variation or smooth change in amplitude.

An acoustical term referring to the attack, steady state (or duration), and decay of a sound.

Envelopes seen in a dream, omens news of a sorrowful cast.   

The shape of the graph as amplitude is plotted against time. A sound's envelope includes its attack, decay, sustain and release (ADSR). (Sound)

The outermost parts of a building that separate the interior environment from the outside weather, usually the walls and roof.

(n) a flat (usually rectangular) container for a letter, thin package, etc.(n) any wrapper or covering(n) a curve that is tangent to each of a family of curves(n) a natural covering (as by a fluid)(n) [..]

theca

an aircraft's center of gravity and weight must fall within acceptable limits in order to be capable of safe flight. These limits are specified by the manufacturer and are referred to as the enve [..]

[0,1] the shape of a loudness curve in time; normally this includes an attack

A visual representation of the ADSR. Amplitude vs. Time graph. A sound’s envelope includes its attack, decay, sustain, and release.

changes in a sound over time, including alterations in a sound's amplitude, frequency and timbre.

 In audio recording software this refers to the way in which the level of a sound or signal varies over time, including alterations in a sound’s amplitude, frequency and timbre. In MIDI, an instrument [..]

The graphic representation of a sound's attack, duration, and pattern of decay.

The Membrane system of the Cell Nucleus that surrounds the nucleoplasm. It consists of two concentric Membranes separated by the perinuclear space. The structures of the envelope where it opens to the [..]

The outer coat of HIV, made up of two layers of lipids (fatty molecules). HIV uses protein "spikes" embedded in its envelope to enter host cells. See Related Term(s): Capsid, Enzyme, Glycoprotein, Human Immunodeficiency Virus, Ribonucleic Acid Image(s): (Click to enlarge)

outer surface of a virus, also called the coat. Not all viruses have an envelope. (See also virus; env.)

 - a viral protein that forms the viral envelope or surface of HIV-1.

, a sheath of carton or wax surrounding the nest of a social insect, especially that of a social wasp (Hymenoptera: Vespidae) (Wilson).

The surface structures of bacteria

A lipid (fatty) covering that surrounds a viral particle. It is derived from the cell membrane of the host cell when the virus buds, or exits, the infected cell. The envelope is important for entry in [..]

Outer surface of a virus, also called the coat. Not all viruses have an envelope. epitope

A lipoprotein outer layer of enveloped viruses that is derived from the plasma membrane of the host cell.

the gas bag of a pressure or semi-rigid airship. Unlike a rigid airship gas cell, an envelope forms an external barrier to the elements, and when pressurized, serves an integral role in maintaining th [..]

Tactical performance graphs show altitude and speed restrictions for an aircraft. Add drag index lines and G limits and you wind up with a graph with criss-crossing lines that resembles an envelope, w [..]

The maximum performance parameters of an aircraft; flying at the edge of the envelope can be both exciting and dangerous.

The safe or effective ranges of operation for aircraft or missile systems.

Container, usually flexible, or the lifting gas or hot air of an airship or balloon.

An activating strategy used prior to beginning a new topic.

1) How a sound or audio signal varies in intensity over a time span. 2) How a control voltage varies in level over time controlling a parameter of something other than gain or audio level.

A paper or cardboard wrapper used to enclose small, flat items, especially letters, for mailing. *(tire); *