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Virtual4 entries found. From Webster's Revised Unabridged Dictionary (1913) [web1913] Virtual \Vir"tu*al\ (?; 135), a. [Cf. F. virtuel. See {Virtue}.] 1. Having the power of acting or of invisible efficacy without the agency of the material or sensible part; potential; energizing. Heat and cold have a virtual transition, without communication of substance. --Bacon. Every kind that lives, Fomented by his virtual power, and warmed. --Milton. 2. Being in essence or effect, not in fact; as, the virtual presence of a man in his agent or substitute. A thing has a virtual existence when it has all the conditions necessary to its actual existence. --Fleming. To mask by slight differences in the manners a virtual identity in the substance. --De Quincey. {Principle of virtual velocities} (Mech.), the law that when several forces are in equilibrium, the algebraic sum of their virtual moments is equal to zero. {Virtual focus} (Opt.), the point from which rays, having been rendered divergent by reflection of refraction, appear to issue; the point at which converging rays would meet if not reflected or refracted before they reach it. {Virtual image}. (Optics) See under {Image}. {Virtual moment} (of a force) (Mech.), the product of the intensity of the force multiplied by the virtual velocity of its point of application; -- sometimes called {virtual work}. {Virtual velocity} (Mech.), a minute hypothetical displacement, assumed in analysis to facilitate the investigation of statical problems. With respect to any given force of a number of forces holding a material system in equilibrium, it is the projection, upon the direction of the force, of a line joining its point of application with a new position of that point indefinitely near to the first, to which the point is conceived to have been moved, without disturbing the equilibrium of the system, or the connections of its parts with each other. Strictly speaking, it is not a velocity but a length. {Virtual work}. (Mech.) See {Virtual moment}, above. From WordNet (r) 1.6 [wn] virtual adj 1: being actually such in almost every respect; "a practical failure"; "the once elegant temple lay in virtual ruin" [syn: {virtual(a)}, {practical(a)}] 2: being such in essence or effect though not in actual fact; "a virtual dependence on charity"; "a virtual revolution"; "virtual reality" [syn: {virtual(a)}] From Jargon File (4.2.3, 23 NOV 2000) [jargon] virtual adj. [via the technical term `virtual memory', prob. from the term `virtual image' in optics] 1. Common alternative to {logical}; often used to refer to the artificial objects (like addressable virtual memory larger than physical memory) simulated by a computer system as a convenient way to manage access to shared resources. 2. Simulated; performing the functions of something that isn't really there. An imaginative child's doll may be a virtual playmate. Oppose {real}. From The Free On-line Dictionary of Computing (13 Mar 01) [foldoc] virtual <jargon, architecture> (Via the technical term {virtual memory}, probably from the term "virtual image" in optics) 1. Common alternative to {logical}; often used to refer to the artificial objects (like addressable {virtual memory} larger than physical memory) created by a computer system to help the system control access to shared resources. 2. Simulated; performing the functions of something that isn't really there. An imaginative child's doll may be a virtual playmate. Opposite of {real} or physical. [{Jargon File}] (1994-11-30) |
Virtual4 entries found.
From Webster's Revised Unabridged Dictionary (1913) [web1913]
Virtual \Vir"tu*al\ (?; 135), a. [Cf. F. virtuel. See {Virtue}.]
1. Having the power of acting or of invisible efficacy
without the agency of the material or sensible part;
potential; energizing.
Heat and cold have a virtual transition, without
communication of substance. --Bacon.
Every kind that lives, Fomented by his virtual
power, and warmed. --Milton.
2. Being in essence or effect, not in fact; as, the virtual
presence of a man in his agent or substitute.
A thing has a virtual existence when it has all the
conditions necessary to its actual existence.
--Fleming.
To mask by slight differences in the manners a
virtual identity in the substance. --De Quincey.
{Principle of virtual velocities} (Mech.), the law that when
several forces are in equilibrium, the algebraic sum of
their virtual moments is equal to zero.
{Virtual focus} (Opt.), the point from which rays, having
been rendered divergent by reflection of refraction,
appear to issue; the point at which converging rays would
meet if not reflected or refracted before they reach it.
{Virtual image}. (Optics) See under {Image}.
{Virtual moment} (of a force) (Mech.), the product of the
intensity of the force multiplied by the virtual velocity
of its point of application; -- sometimes called {virtual
work}.
{Virtual velocity} (Mech.), a minute hypothetical
displacement, assumed in analysis to facilitate the
investigation of statical problems. With respect to any
given force of a number of forces holding a material
system in equilibrium, it is the projection, upon the
direction of the force, of a line joining its point of
application with a new position of that point indefinitely
near to the first, to which the point is conceived to have
been moved, without disturbing the equilibrium of the
system, or the connections of its parts with each other.
Strictly speaking, it is not a velocity but a length.
{Virtual work}. (Mech.) See {Virtual moment}, above.
From WordNet (r) 1.6 [wn]
virtual
adj 1: being actually such in almost every respect; "a practical
failure"; "the once elegant temple lay in virtual
ruin" [syn: {virtual(a)}, {practical(a)}]
2: being such in essence or effect though not in actual fact;
"a virtual dependence on charity"; "a virtual revolution";
"virtual reality" [syn: {virtual(a)}]
From Jargon File (4.2.3, 23 NOV 2000) [jargon]
virtual adj. [via the technical term `virtual memory', prob.
from the term `virtual image' in optics] 1. Common alternative to
{logical}; often used to refer to the artificial objects (like addressable
virtual memory larger than physical memory) simulated by a computer system
as a convenient way to manage access to shared resources. 2. Simulated;
performing the functions of something that isn't really there.
An imaginative child's doll may be a virtual playmate. Oppose {real}.
From The Free On-line Dictionary of Computing (13 Mar 01) [foldoc]
virtual
<jargon, architecture> (Via the technical term {virtual
memory}, probably from the term "virtual image" in optics)
1. Common alternative to {logical}; often used to refer to the
artificial objects (like addressable {virtual memory} larger
than physical memory) created by a computer system to help the
system control access to shared resources.
2. Simulated; performing the functions of something that isn't
really there. An imaginative child's doll may be a virtual
playmate.
Opposite of {real} or physical.
[{Jargon File}]
(1994-11-30)
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