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/duˈæləti/ Listen

Duality

noun

Being twofold; a classification into two opposed parts or subclasses. Synonym: dichotomy.

(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.

(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

... his volition, fought for the destruction of slavery. Just as soon as this second truth came up and took distinct shape beside the other, angry political divisions sundered the Unionists. Abolition of slavery never displaced Union as a purpose of the war; but the two became mingled, in a duality which could not afterward be resolved into its component parts so that one could be taken and the other could be left. The union of the two issues meant the disunion of the people of the Middle and even of ...

— Abraham Lincoln, Vol. II • John T. Morse

... made, duties to perform, evil to be faced. The bodily temptations are absent, but there is still that which lay behind the bodily frailties—curiosity, love of sensation, excitement, desire; the strong duality of nature—the knowledge of duty on the one hand and the indolent shrinking from performance—that is all there; there is the same sense of isolation, and the same need for patient endeavour as upon earth. All that ...

— The Child of the Dawn • Arthur Christopher Benson

... 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. ...

— The Kybalion - A Study of The Hermetic Philosophy of Ancient Egypt and Greece • Three Initiates

... is it altogether peculiar to it. So far as I am aware no person was ever born married, and in extreme youth bachelors and spinsters are so common as to call for no remark. Nature strives, not for duality as in the case of the Siamese Twins but for individuality. We are all born strongly separated, and I am often inclined to fancy that this ceremony of joining appears very like flying in the face of Providence. I have also thought, on ...

— Here are Ladies • James Stephens

... the highest class), and the emotional part of us. If the scope and capacity of the art, and the evolutionary processes which its history discloses (a record of which is preserved in its nomenclature), are to be understood, it is essential that this duality be kept in view. There is something so potent and elemental in the appeal which music makes that it is possible to derive pleasure from even an unwilling hearing or a hearing unaccompanied by effort at analysis; but real appreciation of its beauty, which ...

— How to Listen to Music, 7th ed. - Hints and Suggestions to Untaught Lovers of the Art • Henry Edward Krehbiel

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