Background for envelopes

envelopes

/ˈɛnvəloʊps/ /ˈɑːnvəloʊps/

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noun

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

Examples :

"My sister used brightly colored envelopes to mail her thank-you notes to her friends. "

stationery communication

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noun

Something that envelops; a wrapping.

Examples :

"She stacked the envelopes before putting the letters inside. "

stationery material

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noun

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

Examples :

"The engineers carefully inspected the airship's envelopes for any leaks before the flight. "

vehicle nautical technical machine part

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noun

A mathematical curve, surface, or higher-dimensional object that is the tangent to a given family of lines, curves, surfaces, or higher-dimensional objects.

Examples :

"The light trails from many fireflies, when viewed together, appear to define envelopes that trace the shape of the bushes they surround. "

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noun

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

Examples :

"The technician studied the envelopes of the radio signals, searching for any sudden changes in amplitude. "

electronics technology physics math technical signal

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noun

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

Examples :

"The synthesizer allows you to adjust the envelopes of the drum sounds, making them short and punchy or long and sustained. "

music sound electronics technology signal

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noun

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

Examples :

"The email envelopes contain addressing and security information the system needs to deliver the message, but the recipient only sees the actual email content. "

communication technology internet computing signal

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noun

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

Examples :

"The virus has protein envelopes that help it enter cells. "

anatomy biology medicine structure

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noun

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

Examples :

"The safety envelopes for the new amusement park ride clearly state the maximum height and weight allowed for each passenger. "

technology system technical

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noun

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

Examples :

"Through the telescope, the comet's envelopes, glowing faintly, expanded as it approached the sun. "

astronomy space

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noun

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

Examples :

"Because the attack came from multiple directions, the defenders built envelopes around the outer fort, creating additional layers of protection. "

military architecture