coma
Envelope En"vel*ope (?; 277), Envelop En*vel"op (?; 277), n. [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. [1913 Webster]

2. (Astron.) The nebulous covering of the head or nucleus of a comet; -- called also {coma}. [1913 Webster]

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. --Wilhelm. [1913 Webster]

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. [PJC]

{push the envelope} to increase the capability of some type of machine or system; -- usually by technological development. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Synonyms:

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  • coma — coma …   Dictionnaire des rimes

  • COMA — Le coma est un état caractérisé par la perte de la conscience et par la perte plus ou moins complète des fonctions de relation: sensibilité et motricité. Cependant, certaines fonctions végétatives (qui entretiennent la nutrition) sont… …   Encyclopédie Universelle

  • Coma — puede tener los siguientes significados: en medicina, coma (del griego κῶμα o κωμα sopor) es un estado severo de pérdida de consciencia. la coma [,] (del griego κόμμα corte) es un signo de puntuación. en matemáticas, al separador decimal entre… …   Wikipedia Español

  • coma — m. neurol. Estado de sopor profundo debido a una alteración del sistema reticular activador ascendente. El paciente ha perdido la sensibilidad, la movilidad y se muestra inconsciente pero conserva las funciones vegetativas (respiración,… …   Diccionario médico

  • coma — |ô| s. f. 1. Cabeleira. 2. Cabelo comprido. 3. Crina do cavalo. 4. Juba do leão. 5. Penas compridas que adornam a cabeça de certas aves. = PENACHO 6. Plumas do capacete. = PENACHO 7. Copa (do arvoredo). 8.  [Astronomia] Cabeleira de cometa. 9. … …   Dicionário da Língua Portuguesa

  • COMA — olim libertatis insigne, apud Gallos praesertim: unde Regalis capillitii ius priscis Francis, adeo celebre, apud Hottomannum, Francogalliae, c. 9. Aimoinum, de Gestis Francorum, l. 3. c. 61. etc. Certe omnes Galliae Reges usque ad Pippinum Caroli …   Hofmann J. Lexicon universale

  • Coma — Пётр Рогуцкий лидер группы COMA во время концерта в Мегаклу …   Википедия

  • coma — CÓMA, come, s.f. (fiz.) 1. Aberaţie a sistemelor optice care constă în apariţia unei imagini în formă de cometă. 2. Aberaţie a lentilelor electronice, caracterizată prin apariţia unei estompări spre periferia imaginii. – Din fr. coma. Trimis de… …   Dicționar Român

  • coma — sustantivo masculino 1. (no contable) Pérdida de conciencia prolongada en que permanecen algunos enfermos graves: El accidentado estuvo un mes en estado de coma. sustantivo femenino 1. Signo ortográfico de puntuación que indica una separación o… …   Diccionario Salamanca de la Lengua Española

  • Coma — Verbrauchermärkte GmbH Co KG Rechtsform GmbH Co KG Gründung 1977 Sitz Meppen Mitarbeiter ca. 1.400 Website …   Deutsch Wikipedia

  • Coma — Co ma, n. [L., hair, fr. Gr. ko mh.] 1. (Astron.) The envelope of a comet; a nebulous covering, which surrounds the nucleus or body of a comet. [1913 Webster] 2. (Bot.) A tuft or bunch, as the assemblage of branches forming the head of a tree; or …   The Collaborative International Dictionary of English

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