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Duality   /duˈæləti/   Listen
Duality

noun
1.
Being twofold; a classification into two opposed parts or subclasses.  Synonym: dichotomy.
2.
(physics) the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory.  Synonym: wave-particle duality.
3.
(geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry.






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"Duality" Quotes from Famous Books



... for one and the others are all things, and there is no third existence besides them. And the whole of one cannot be in others nor parts of it, for it is separated from others and has no parts, and therefore the others have no unity, nor plurality, nor duality, nor any other number, nor any opposition or distinction, such as likeness and unlikeness, some and other, generation and corruption, odd and even. For if they had these they would partake either ...
— Parmenides • Plato

... virtue of which, any two such particles, without any external impression of motion, or intermediate material agent, were supposed to tend to approach or remove from one another; and this view of the duality of the causes of motion is very widely ...
— The Advance of Science in the Last Half-Century • T.H. (Thomas Henry) Huxley

... forces, has two modes of representing objects to himself, and of feeling them; these are, the real or limited, and the ideal or infinite; and the mixed feeling that he will awaken will always testify to this duality of origin. Sentimental poetry thus admitting more than one principle, it remains to know which of the two will be predominant in the poet, both in his fashion of feeling and in that of representing the object; and consequently a difference in the mode ...
— The Works of Frederich Schiller in English • Frederich Schiller

... from the gentleman's direct control, the craftsman, the merchant, and the trading sailor, essentially accessory classes, producers of, and dealers in, the accessories of life, and mitigating and clouding only very slightly that broad duality. ...
— Anticipations - Of the Reaction of Mechanical and Scientific Progress upon - Human life and Thought • Herbert George Wells

... settlement within the limits of the Empire. If only these necessary things are granted to him, he promises, and not without intending to keep his promise, to be a peaceable subject, yes and a staunch defender, of the Roman Augustus. Had the Imperial statesmen truly understood this strange duality of purpose in the minds of their barbarian visitors, and had they set themselves loyally and patiently to foster the peaceful agricultural instincts of the Teuton, haply the Roman Empire might still be standing. As it was, the statesmen ...
— Theodoric the Goth - Barbarian Champion of Civilisation • Thomas Hodgkin

... desire upon the sudden as to bring him into that snare which he would shun otherwise.' He poisoned James's mind incurably against 'those wicked villains,' 'that crew,' and its 'hypocrisy,' the 'accursed duality,' or 'the triplicity that denies the Trinity.' By the triplicity he signified Ralegh, Cobham, and Northumberland. Ralegh had other enemies besides. Among them was Cobham's new wife, Frances Howard, Countess dowager of Kildare, daughter of the Lord Admiral. Henry Howard, who did not like her, ...
— Sir Walter Ralegh - A Biography • William Stebbing

... him as the Fons et Principium of the Son, and therefore gives him superior power and glory. It does not even assert the claims of the blessed Spirit to Godhead, and therefore leaves room to doubt whether it means to recognize a Trinity, or only a Duality." (Moses Stuart, Bib. Repos., 1835, quoted by Wilson, Trin. Test., ...
— Orthodoxy: Its Truths And Errors • James Freeman Clarke

... with which we count (abstract) and the number inherent in the things counted (concrete). "One" is a thing— the thing counted. Unity is that by which oneness is denoted. Again "two" belongs to the class of things as men or stones; but not so duality; duality is merely that whereby two men or two stones are denoted; and so on. Therefore a repetition of unities[17] produces plurality when it is a question of abstract, but not when it is a question of concrete things, as, for example, if I say of one and the same thing, "one sword, one brand, ...
— The Theological Tractates and The Consolation of Philosophy • Anicius Manlius Severinus Boethius

... observation on the other. The manner in which this synthesis may be effected is perfectly simple. We have only to suppose that the antithesis between mind and motion—subject and object—is itself phenomenal or apparent: not absolute or real. We have only to suppose that the seeming duality is relative to our modes of apprehension; and, therefore, that any change taking place in the mind, and any corresponding change taking place in the brain, are really not two changes, but one change. When a violin is played upon we hear a musical sound, and at the ...
— Mind and Motion and Monism • George John Romanes

... my life, advanced infallibly in one direction and in one direction only. It was on the moral side, and in my own person, that I learned to recognise the thorough and primitive duality of man; I saw that, of the two natures that contended in the field of my consciousness, even if I could rightly be said to be either, it was only because I was radically both; and from an early date, ...
— Dr. Jekyll and Mr. Hyde • ROBERT LOUIS STEVENSON

... doublet, dyad, team, span, twain; twins. Associated Words: dual, duality, double, dualism, duplex, duplicate, duplication, bifarious, binary, dimidiate, dimidiation, duet, dialogue, ...
— Putnam's Word Book • Louis A. Flemming

... temple of adoration, then desecrate the fane; it will give all, yet ruthlessly seize everything; it delights in pleasing, yet it sometimes wittingly wounds; its ineffable tenderness often merges into an inclemency extraordinary; —symbol of universal duality, it is at ...
— Hints for Lovers • Arnold Haultain

... languid pulse of the sentiment of union; did he see a broiled chicken, it called up to his mind's eye the bird of our uncommon country, with the gridiron on his breast, liable to be reduced at any moment to the heraldic duality of his Austrian congener by the strife of contending sections pulling in opposite directions; an innocent pippin was enough to suggest the apple of discord; and with the removal of the cloth came a dessert of diagnoses on the cancer that was supposed ...
— Atlantic Monthly, Volume 2, Issue 10, August, 1858 • Various

... body when considered under its attribute of extension, and spirit when considered under its attribute of thought. It is quite impossible for two substances to affect each other, because by their reciprocal influence, nay, by their very duality, they would lose their independence, and, with this, their substantiality. There is no plurality of substances, but only one, the infinite, the divine substance. Here we reach the center of the system. There is but one becoming and but one independent, substantial ...
— History Of Modern Philosophy - From Nicolas of Cusa to the Present Time • Richard Falckenberg

... Hermetic teaching does not imply a real duality—THE ALL is ONE—the Two Aspects are merely aspects of manifestation. The teaching is that The Masculine Principle manifested by THE ALL stands, in a way, apart from the actual mental creation of the Universe. It projects its Will toward the Feminine Principle ...
— The Kybalion - A Study of The Hermetic Philosophy of Ancient Egypt and Greece • Three Initiates

... will suffice. For Pythagoras thought number had the greatest power and reduced everything to numbers—both the motions of the stars and the creation of living beings. And he established two supreme principles,—one finite unity, the other infinite duality. The one the principle of good, the other of evil. For the nature of unity being innate in what surrounds the whole creation gives order to it, to souls virtue, to bodies health, to cities and dwellings peace and ...
— Essays and Miscellanies - The Complete Works Volume 3 • Plutarch

... of censuring the conclusion of a letter of his to the Dean of St. Paul's. He subscribed himself 'humbly yours,' and I objected to the adverb. 'Well, but, Tyndall,' he said, 'I am humble; and still it would be a great mistake to think that I am not also proud.' This duality ran through his character. A democrat in his defiance of all authority which unfairly limited his freedom of thought, and still ready to stoop in reverence to all that was really worthy of reverence, in the customs of the world or ...
— Faraday As A Discoverer • John Tyndall

... an evil spell over metaphysicians. It is admitted that in real life it is not well for One to be alone, and I think pure unity is no less barren and graceless in metaphysics. You must have plurality to start with, or trinity, or at least duality, if you wish to get anywhere, even if you wish to get effectively into the bosom of the One, abandoning your separate existence. Freud, like Empedocles, has prudently introduced a prior principle for Love ...
— Some Turns of Thought in Modern Philosophy - Five Essays • George Santayana

... misery are swallowed up and sink into insignificance and nullity compared with this: this present, they disappear: this absent, each alone is sufficient to wreck the soul, fluttering about without rudder or ballast on the waves of the world. Duality is the root, out of which alone, for mortals, happiness can spring. And the old Hindoo mythology, which is far deeper in its simplicity than the later idealistic pessimism, expresses this beautifully by giving to every ...
— The Substance of a Dream • F. W. Bain

... remind one of Sir John Suckling. They are 'sunned o'er with love'—their subject, by the way. 'I never have been false to thee' was an emanation from the FEMININE nature of the minstrel alone. Who does not believe the poet gifted with duality of soul? 'Think of me, my own beloved,' and 'Rosabel,' are the throbbings of a lover's breast, set to music; and 'One balmy summer night, Mary,' 'The heart that owns thy tyrant sway,' and 'When I was in my teens,' the distillation of the subtlest sweets lodged in the ...
— Poems • George P. Morris

... death of an old servant, he exclaimed, "Well, I don't know that I feel his loss so much, after all. For the first seven years he was an obliging servant; for the second seven years an agreeable companion; but for the last seven years he was a tyrannical master." This duality of epigrams seems to show a discrepancy somewhere; or are we to believe that the wits of the Regency used to drive their jokes as hired hacks, like the livery carriages employed by faded dowagers in Hampton Court? The rest of ...
— Lippincott's Magazine of Popular Literature and Science Vol. XV., No. 85. January, 1875. • Various

... associate to his own rank of Augustus in the person of Maximian—an experienced general; whilst each of them in effect multiplied his own office still farther by severally appointing a Csar, or hereditary prince. And thus the very same partition of the public authority, by means of a duality of emperors, to which the senate had often resorted of late, as the best means of restoring their own republican aristocracy, was now adopted by Dioclesian as the simplest engine for overthrowing finally the power of either senate or army to interfere with the elective privilege. This he endeavored ...
— The Caesars • Thomas de Quincey

... asleep. In the morning they were all carried into the citadel, and thrown into a dungeon. From that time we have declined any addition to our party, and kept apart to ourselves, for there is safety in unity, but danger in duality or a multitude.—When an individual of a sect committed an act of folly, the high and the low sunk in their dignity. Dost thou not see that one ox in a pasturage will cast a slur upon all the oxen ...
— Persian Literature, Volume 2, Comprising The Shah Nameh, The - Rubaiyat, The Divan, and The Gulistan • Anonymous

... acquired a happy smattering of various information, she used it with good effect—she passed for a singularly well informed woman in Washington. The quality of her literary tastes had necessarily undergone constant improvement under this regimen, and as necessarily, also; the duality of her language had improved, though it cannot be denied that now and then her former condition of life betrayed itself in just perceptible inelegancies of expression and ...
— The Gilded Age, Part 4. • Mark Twain (Samuel Clemens) and Charles Dudley Warner

... betrays when it is deeply stirred. Not only are chance and divination welcomed into the world but they are reverenced all the more, like the wind and fire of idolaters, precisely for not being amenable to the petty rules of human reason. In truth, however, the English duality between prudence and science is no more fundamental than the German duality between reason and understanding.[A] The true contrast is between impulse and reflection, instinct and intelligence. When men feel the primordial authority of ...
— The Life of Reason • George Santayana

... injured by a single act of pairing, must, in most cases, remain strangers to the females. Can the mothers, in fact, dispense with their assistance, without being deprived of offspring on that account? I do not say yes, but I do not say no. The duality of the sexes is a hard problem. Why two sexes? Why not just one? It would have been much simpler and saved a great deal of foolery. Why such a thing as sex, when the tuber of the Jerusalem artichoke ...
— The Life of the Fly - With Which are Interspersed Some Chapters of Autobiography • J. Henri Fabre

... riddle made; who wants the vain duality? Is not myself enough for me? what need of "I" within ...
— The Kasidah of Haji Abdu El-Yezdi • Richard F. Burton



Words linked to "Duality" :   physics, interchangeableness, wave-particle duality, classification, exchangeability, dichotomy, categorisation, property, fungibility, dual, interchangeability, geometry, natural philosophy, categorization



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