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7 definitions found
From The Collaborative International Dictionary of English v.0.44 : [ gcide ]
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.
[1913 Webster]
Heat and cold have a virtual transition, without
communication of substance. --Bacon.
[1913 Webster]
Every kind that lives,
Fomented by his virtual power, and warmed. --Milton.
[1913 Webster]
2. Being in essence or effect, not in fact; as, the virtual
presence of a man in his agent or substitute.
[1913 Webster]
A thing has a virtual existence when it has all the
conditions necessary to its actual existence.
--Fleming.
[1913 Webster]
To mask by slight differences in the manners a
virtual identity in the substance. --De Quincey.
[1913 Webster]
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.
[1913 Webster]
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 English Wiktionary: All languages (2023-07-27) : [ dictinfo.com:wikt-en-ALL-2023-07-27 ]
virtual focus
n.
(lb en optics) A point#Noun from which light#Noun or other radiation
apparently emanates, such as in the virtual image produce#Verb by a
plane#Adjective mirror#Noun.
From English Wiktionary: English language only (2023-07-27) : [ dictinfo.com:wikt-en-en-2023-07-27 ]
virtual focus
n.
(lb en optics) A point#Noun from which light#Noun or other radiation
apparently emanates, such as in the virtual image produce#Verb by a
plane#Adjective mirror#Noun.
From English Wiktionary: Western, Greek, and Slavonic languages only (2023-07-27) : [ dictinfo.com:wikt-en-Western_Greek_Slavonic-2023-07-27 ]
virtual focus
n.
(lb en optics) A point#Noun from which light#Noun or other radiation
apparently emanates, such as in the virtual image produce#Verb by a
plane#Adjective mirror#Noun.
From English Wiktionary: Western languages only (2023-07-27) : [ dictinfo.com:wikt-en-Western-2023-07-27 ]
virtual focus
n.
(lb en optics) A point#Noun from which light#Noun or other radiation
apparently emanates, such as in the virtual image produce#Verb by a
plane#Adjective mirror#Noun.
From English-suomi FreeDict+WikDict dictionary ver. 2023.05.29 : [ freedict:eng-fin ]
virtual focus /vˈɜːtʃuːəl fˈəʊkəs/
valepolttopiste
virtual point in virtual image
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