Philosophy. the theory that only the self exists, or can be proved to exist.
extreme preoccupation with and indulgence of one's feelings, desires, etc.; egoistic self-absorption.

1880–85; sol(i)-1 + Latin ips(e) self + -ism

solipsismal, adjective
solipsist, noun, adjective
solipsistic [sol-ip-sis-tik] , adjective

solecism, solipsism. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
solipsism (ˈsɒlɪpˌsɪzəm)
philosophy the extreme form of scepticism which denies the possibility of any knowledge other than of one's own existence
[C19: from Latin sōlus alone + ipse self]
n, —adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1874, coined from L. solus "alone" + ipse "self." The view or theory that self is the only object of real knowledge or the only thing that is real.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
solipsism [(sol-uhp-siz-uhm, soh-luhp-siz-uhm)]

The belief that all reality is just one's own imagining of reality, and that one's self is the only thing that exists.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica


in philosophy, formerly, moral egoism (as used in the writings of Immanuel Kant), but now, in an epistemological sense, the extreme form of subjective idealism that denies that the human mind has any valid ground for believing in the existence of anything but itself. The British idealist F.H. Bradley, in Appearance and Reality (1897), characterized the solipsistic view as follows: "I cannot transcend experience, and experience is my experience. From this it follows that nothing beyond myself exists; for what is experience is its (the self 's) states."

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Close friends of mine prefer to shutter themselves inside a warm, glowing
The controversy is a kind of unholy combination of inside-the-Beltway myopia
  and journalistic solipsism.
Which, you must admit, is taking both narcissism and solipsism to new depths.
That's solipsism and seems make everything fit together.
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