Pos·i·tive a.
 1. Having a real position, existence, or energy; existing in fact; real; actual; -- opposed to negative. “Positive good.”
 2. Derived from an object by itself; not dependent on changing circumstances or relations; absolute; -- opposed to relative; as, the idea of beauty is not positive, but depends on the different tastes individuals.
 3. Definitely laid down; explicitly stated; clearly expressed; -- opposed to implied; as, a positive declaration or promise.
    Positive words, that he would not bear arms against King Edward's son.   --Bacon.
 4. Hence: Not admitting of any doubt, condition, qualification, or discretion; not dependent on circumstances or probabilities; not speculative; compelling assent or obedience; peremptory; indisputable; decisive; as, positive instructions; positive truth; positive proof. “'T is positive 'gainst all exceptions.”
 5. Prescribed by express enactment or institution; settled by arbitrary appointment; said of laws.
    In laws, that which is natural bindeth universally; that which is positive, not so.   --Hooker.
 6. Fully assured; confident; certain; sometimes, overconfident; dogmatic; overbearing; -- said of persons.
 Some positive, persisting fops we know,
 That, if once wrong, will needs be always.   --Pope.
 7. Having the power of direct action or influence; as, a positive voice in legislation.
 8. Photog. Corresponding with the original in respect to the position of lights and shades, instead of having the lights and shades reversed; as, a positive picture.
 9. Chem. (a) Electro-positive. (b) Hence, basic; metallic; not acid; -- opposed to negative, and said of metals, bases, and basic radicals.
 10. Mach. & Mech. (a) Designating, or pertaining to, a motion or device in which the movement derived from a driver, or the grip or hold of a restraining piece, is communicated through an unyielding intermediate piece or pieces; as, a claw clutch is a positive clutch, while a friction clutch is not. (b) Designating, or pertaining to, a device giving a to-and-fro motion; as, a positive dobby.
 11.  Vehicles Designating a method of steering or turning in which the steering wheels move so that they describe concentric arcs in making a turn, to insure freedom from side slip or harmful resistance.
 Positive crystals Opt., a doubly refracting crystal in which the index of refraction for the extraordinary ray is greater than for the ordinary ray, and the former is refracted nearer to the axis than the latter, as quartz and ice; -- opposed to negative crystal, or one in which this characteristic is reversed, as Iceland spar, tourmaline, etc.
 Positive degree Gram., that state of an adjective or adverb which denotes simple quality, without comparison or relation to increase or diminution; as, wise, noble.
 Positive electricity Elec, the kind of electricity which is developed when glass is rubbed with silk, or which appears at that pole of a voltaic battery attached to the plate that is not attacked by the exciting liquid; -- formerly called vitreous electricity; -- opposed to negative electricity.
 Positive eyepiece. See under Eyepiece.
 Positive law. See Municipal law, under Law.
 Positive motion Mach., motion which is derived from a driver through unyielding intermediate pieces, or by direct contact, and not through elastic connections, nor by means of friction, gravity, etc.; definite motion.
 Positive philosophy. See Positivism.
 Positive pole. (a) Elec. The pole of a battery or pile which yields positive or vitreous electricity; -- opposed to negative pole. (b) Magnetism The north pole. [R.]
 Positive quantity Alg., an affirmative quantity, or one affected by the sign plus [+].
 Positive rotation Mech., left-handed rotation.
 Positive sign Math., the sign [+] denoting plus, or more, or addition.


 Vit·re·ous a.
 1. Consisting of, or resembling, glass; glassy; as, vitreous rocks.
 2. Of or pertaining to glass; derived from glass; as, vitreous electricity.
 Vitreous body Anat., the vitreous humor.  See the Note under Eye.
 Vitreous electricity Elec., the kind of electricity excited by rubbing glass with certain substances, as silk; positive electricity; -- opposed to resinous, or negative, electricity.
 Vitreous humor. Anat. See the Note under Eye.
 Vitreous sponge Zool., any one of numerous species of siliceous sponges having, often fibrous, glassy spicules which are normally six-rayed; a hexactinellid sponge.  See Venus's basket, under Venus.

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 e·lec·tri·cian n.
 1. An investigator of electricity; one versed in the science of electricity. [archaic]
 Note: ☞ Electricity is manifested under following different forms: (a) Statical electricity, called also Frictional electricity or Common electricity, electricity in the condition of a stationary charge, in which the disturbance is produced by friction, as of glass, amber, etc., or by induction. (b) Dynamical electricity, called also Voltaic electricity, electricity in motion, or as a current produced by chemical decomposition, as by means of a voltaic battery, or by mechanical action, as by dynamo-electric machines. (c) Thermoelectricity, in which the disturbing cause is heat (attended possibly with some chemical action).  It is developed by uniting two pieces of unlike metals in a bar, and then heating the bar unequally. (d) Atmospheric electricity, any condition of electrical disturbance in the atmosphere or clouds, due to some or all of the above mentioned causes. (e) Magnetic electricity, electricity developed by the action of magnets. (f)  Positive electricity, the electricity that appears at the positive pole or anode of a battery, or that is produced by friction of glass; -- called also vitreous electricity.  (g) Negative electricity, the electricity that appears at the negative pole or cathode, or is produced by the friction of resinous substance; -- called also resinous electricity. (h) Organic electricity, that which is developed in organic structures, either animal or vegetable, the phrase animal electricity being much more common.
 3. The science which studies the phenomena and laws of electricity; electrical science.
 4. Fig.: excitement, anticipation, or emotional tension, usually caused by the occurrence or expectation of something unusual or important.

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