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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



... relation between two, and in superlatives a relation between many, lies at the bottom, it is natural that their suffixes should be transferred to other words, whose chief notion is individualised through that of duality or plurality."—"Vergleichende Grammatik," s. 292, Eastwick's ...
— A Handbook of the English Language • Robert Gordon Latham

... forces, elements, germs or whatsoever. These two elements differ in nature and in function, and each is incomplete and worthless by itself. It is only by the combining of the two that any new result is obtained. It is this fact that has led to the most suggestive and beautiful phrase "The duality ...
— Sane Sex Life and Sane Sex Living • H.W. Long

... feature, and in the belief of many represents America's most valuable contribution to the science of government, is being forgotten. Formed to be "an indestructible Union composed of indestructible states," our dual system is losing its duality. The states are fading out of ...
— Our Changing Constitution • Charles Pierson

... while he thus lay dying, the mulatto woman, with whom he lived in this part of his extraordinary dual existence, nursed and cared for him with such rude attentions as the surroundings afforded. In the wanderings of his mind the same duality of life followed him. Now and then he would appear the calm, sober, self-contained, well-ordered member of a peaceful society that his friends in his faraway home knew him to be; at other times the nether part of his nature would ...
— Howard Pyle's Book of Pirates • Howard Pyle

... not he, but his malady, was accountable. She believed from her heart in the duality of Forster. There was a hapless page boy whose very presence and assumed stupidity used to inflame his master to perfect Bersaker fits of rage. The scenes were exquisitely ludicrous, if painful; the contrast between the giant and the object of his wrath, scared out ...
— John Forster • Percy Hethrington Fitzgerald

... the two systems sketched above agree on the one hand and diverge on the other may be shortly stated as follows.—Both systems teach advaita, i.e. non-duality or monism. There exist not several fundamentally distinct principles, such as the prak/r/iti and the purushas of the Sa@nkhyas, but there exists only one all-embracing being. While, however, the ...
— The Vedanta-Sutras with the Commentary by Sankaracarya - Sacred Books of the East, Volume 1 • George Thibaut

... highest kind. To their results are now to be added the foregoing, whereby gases and vapours, which have been hitherto thought inaccessible to experiments with the thermo-electric pile, are proved by it to exhibit the indissoluble duality of radiation and absorption, the influence of chemical combination on both being exhibited in the ...
— Fragments of science, V. 1-2 • John Tyndall

... title of "second theme" implying nothing of a secondary nature, but merely its position in order of appearance. No greater step was ever taken in the growth of musical structure than this introduction of a second coequal theme; for the principle of duality, of action and reaction between two forces, runs throughout nature both human and physical, as is seen from the import of the terms: man and woman, active and passive, positive and negative, heat and cold, ...
— Music: An Art and a Language • Walter Raymond Spalding

... many 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 harmony, ...
— Essays and Miscellanies - The Complete Works Volume 3 • Plutarch

... a duality in life that I cannot express except by such images as this, a duality so that we are at once absurd and full of sublimity, and most absurd when we are most anxious to render the real splendours that pervade us. This ...
— First and Last Things • H. G. Wells

... was a kind of groan further off, and as Aurelia felt a hand on her dress, her fight and distress at the duality were complete. While, in the dark, the hands were still groping for her, she eluded them, and succeeded in carrying out Harriet's manoeuvre so far that a quick bright flame leapt forth, lighting up the whole room, and revealing two—yes, two! But it did not die away! In her haste, ...
— Love and Life • Charlotte M. Yonge

... English is a double-barreled language, and that of parallel terms one is likely to be native and the other classic, is interesting in itself. Our lists of parallels, however, though (with the exception of List B) they are arranged to bring out this duality of origin, have other and more vital uses as material for exercises. For after all it matters little whether we know where a word comes from, provided we know thoroughly the meaning and implications of the word itself. The lists already given and those ...
— The Century Vocabulary Builder • Creever & Bachelor

... the myth of Santa Claus and the stockings kept up, although that was a business of less account, and one in which the children themselves had no share, except to wonder, to enjoy, and to receive. You will observe that there is a duality in most of the enjoyments of life,—that if you have a long-expected letter from your brother who is in Yokohama, by the same mail or the next mail there comes a letter from your sister who is in Cawnpore. ...
— The Brick Moon, et. al. • Edward Everett Hale

... animal function, one admits, one insists; it may be only that. But also in the bewildering and humorous and tragic duality of all life's energies, it is the bridge to every eternity which is not merely a spectral condition of earth disembowelled of its lusts. For sex holds the substance of the image. But we must remember with ...
— Lysistrata • Aristophanes

... kinetic resources, if it is too abandoned or prolonged. Play can do just as hard and painful tasks as work, for what we love is done with whole and undivided personality. Work, as too often conceived, is all body and no soul, and makes for duality and not totality. Its constraint is external, mechanical, or it works by fear and not love. Not effort but zestless endeavor is the tragedy of life. Interest and play are one and inseparable as body and soul. Duty itself is not adequately ...
— Youth: Its Education, Regimen, and Hygiene • G. Stanley Hall

... men and women. His mankind is delightful. It is delightful in its tenacity; it refuses to own itself beaten; it will sleep on the battlefield. These warlike images come by themselves under the pen; since from the duality of man's nature and the competition of individuals, the life-history of the earth must in the last instance be a history of a really very relentless warfare. Neither his fellows, nor his gods, nor his passions will leave a man alone. In ...
— Notes on Life and Letters • Joseph Conrad

... exalted speech. He is spiritually great, Mary, and don't you dare smile and think of the widow! We are all dual, old Emerson said it in his ESSAY ON FREE WILL, and Adolph can tell you what old Greek said it. And this duality is where the fight comes in, and the two people walk side by side, to-day is Jekyll's day, and tomorrow is Hyde's, ...
— The Letters of Franklin K. Lane • Franklin K. Lane

... 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, ...
— Theodoric the Goth - Barbarian Champion of Civilisation • Thomas Hodgkin

... the three corresponding qualities of pradhana (the active or spiritual cause of the world) in various proportions produces the mundane order of things. Thus is proved the eternity of prakriti or nature and is also established the doctrine of duality. ...
— The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 1 • Kisari Mohan Ganguli

... this duality of life, I first read Dr. Wigan on the Duality of the Brain, hoping that I could train one side of my head to do these outside jobs, and the other to do my intimate and real duties. For Richard Greenough once told me that, in studying ...
— The Best American Humorous Short Stories • Various

... a summary of the Homeric poem, because he wished to show how simple its construction really was, apart from the episodes. It is impossible, by any process of reduction and simplification, to get rid of the duality in Beowulf. It has many episodes, quite consistent with a general unity of action, but there is something more than episodes, there is a sequel. It is as if to the Odyssey there had been added some later books telling in full of the old age of Odysseus, far from the sea, and his death at ...
— Epic and Romance - Essays on Medieval Literature • W. P. Ker

... sessions in that Tupperossettine dining-room, lair of solid old comfort and fervid old romanticism. Its odd duality befitted well its owner. The distinguished critic and poet, Rossetti's closest friend and Swinburne's, had been, for a while, in the dark ages, a solicitor; and one felt he had been a good one. His frock-coat, though the Muses had crumpled it, inspired confidence in his judgment of other ...
— And Even Now - Essays • Max Beerbohm

... he viewed the dark mass of rolling waters, in colour as in duality unlike those of any other lake, the traveller shuddered as he remembered that beneath these sluggish waves lay the once proud cities of the plain, whose grave was dug by the thunder of the heavens, or the eruption of subterraneous fire, and whose remains were hid, even by that sea which holds ...
— The Talisman • Sir Walter Scott

... 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

... entitled "Directors of the Granaries," or "Directors of the Armoury." There was no law against pluralists, and more than one of them boasts on his tomb of having held simultaneously five or six offices. These storehouses participated like all the other dependencies of the crown, in that duality which characterized the person of the Pharaoh. They would be called in common parlance, the Storehouse or the Double White Storehouse, the Storehouse or the Double Gold Storehouse, the Double Warehouse, the ...
— History Of Egypt, Chaldaea, Syria, Babylonia, and Assyria, Volume 2 (of 12) • G. Maspero

... the toiling class, a little emancipated 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

... the national tone-poet, the singer of his own joys and sorrows and that of his country's. But, while distinguishing these two aspects, we must take care not to regard them as two separate things. They were a duality the constitutive forces of which alternately assumed supremacy. The national poet at no time absorbed the personal, the personal poet at no time disowned the national. His imagination was always ready to conjure up his native atmosphere, nay, we may even say that, ...
— Frederick Chopin as a Man and Musician - Volume 1-2, Complete • Frederick Niecks

... well know, so far from involving Dualism, is based on the One, which becomes Two on manifestation, just as Atheism posits one existence, only cognisable in the duality force and matter, and as philosophic—though not popular—Theism teaches one Deity whereof are spirit and matter. Mr. Bradlaugh's temperate disapproval was not copied in its temperance by some other Freethought leaders, and Mr. Foote especially distinguished himself by the bitterness ...
— Annie Besant - An Autobiography • Annie Besant

... of Jewish and Christian belief. From the Persian priests are derived both the name and the practice of magic. The Evil Principle of the Magian, of the later Jewish, and thence of the western world, originated in the system (claiming Zoroaster as its founder), which taught a duality of Gods. The philosophic lawgiver, unable to penetrate the mystery of the empire of evil and misery in the world, was convinced that there is an equal and antagonistic power to the representative of light and goodness. Hence the continued eternal contention between ...
— The Superstitions of Witchcraft • Howard Williams

... "This horrible duality has often given me matter for reflection. Oh, this terrible second me, always seated whilst the other is on foot, acting, living, suffering, bestirring itself. This second me that I have never been able to intoxicate, to make shed tears, or put to sleep. And how ...
— The Varieties of Religious Experience • William James

... an absolute duality between his lower and higher moods, and the poetic work produced in them, stimulating the reader to look below the immediate surface of his poetry, makes the study of Wordsworth an excellent exercise for the training of those mental powers ...
— Essays from 'The Guardian' • Walter Horatio Pater

... time in the smoking room and then went to his own quarters. In reality he was Somewhat puzzled in his mind by a projection of the beauties of Nora Black upon his desire for Greece and Marjory, His thoughts formed a duality. Once he was on the point of sending his card to Nora Black's parlour, inasmuch as Greece was very distant and he could not start until the morrow. But he suspected that he was holding the interest of the actress because of his recent appearance of impregnable serenity in ...
— Active Service • Stephen Crane

... Canaan where peace did not fall comfortably with the coming of night; a place as alien in habit, in thought, and almost in speech as if it had been upon another continent. And yet—so strange is the duality of towns—it lay but ...
— The Conquest of Canaan • Booth Tarkington

... two kinds of number. There is the number 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 ...
— The Theological Tractates and The Consolation of Philosophy • Anicius Manlius Severinus Boethius



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



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