ENVELOPES

Noun

envelopes

plural of envelope

Source: Wiktionary

ENVELOPE

En"vel*ope, En*vel"op, n. Etym: [F. enveloppe.]

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.)

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

3. (Fort.)

Definition: 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. Wilhelm.

4. (Geom.)

Definition: 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. 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 Increase the capability of some type of machine or system; -- usu. by technological development.

Source: Webster’s Unabridged Dictionary 1913 Edition

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