[dis-in-tuh-res-tid, -tri-stid]
unbiased by personal interest or advantage; not influenced by selfish motives: a disinterested decision by the referee.
not interested; indifferent.

1605–15; dis-1 + interested

disinterestedly, adverb
disinterestedness, noun
nondisinterested, adjective

disinterested, uninterested (see usage note at the current entry).

1. impartial, neutral, unprejudiced, dispassionate. See fair1.

1. partial, biased.

Disinterested and uninterested share a confused and confusing history. Disinterested was originally used to mean “not interested, indifferent”; uninterested in its earliest use meant “impartial.” By various developmental twists, disinterested is now used in both senses. Uninterested is used mainly in the sense “not interested, indifferent.” It is occasionally used to mean “not having a personal or property interest.”
Many object to the use of disinterested to mean “not interested, indifferent.” They insist that disinterested can mean only “impartial”: A disinterested observer is the best judge of behavior. However, both senses are well established in all varieties of English, and the sense intended is almost always clear from the context.
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[dis-in-ter-ist, -trist]
absence of interest; indifference.
verb (used with object)
to divest of interest or concern.

1605–15; dis-1 + interest

disinterest, uninterest.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
disinterest (dɪsˈɪntrɪst, -tərɪst)
1.  freedom from bias or involvement
2.  lack of interest; indifference
3.  (tr) to free from concern for personal interests

disinterested (dɪsˈɪntrɪstɪd, -tərɪs-)
1.  free from bias or partiality; objective
2.  not interested
usage  Many people consider that the use of disinterested to mean not interested is incorrect and that uninterested should be used

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1610s, "unconcerned," the sense we now would ascribe to uninterested; with the sense of "impartial" going to disinteressed (c.1600). Modern meaning of disinterested is first attested 1650s. As things now stand, disinterested means "free from personal bias," while uninterested
means "caring nothing for the matter in question."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But there are a handful of more disinterested views of the settlement.
By doing so, it turns disinterested onlookers in my family into interested
  participants with a surprisingly human experience.
No intelligent disinterested citizen would willingly select such a pavement at
  his own proper expense.
So, those shy students and/or disinterested students all sit there.
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