a person not belonging to a particular group, set, party, etc.: Society often regards the artist as an outsider.
a person unconnected or unacquainted with the matter in question: Not being a parent, I was regarded as an outsider.
a racehorse, sports team, or other competitor not considered likely to win or succeed.
a person or thing not within an enclosure, boundary, etc.

1790–1800; outside + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
outsider (ˌaʊtˈsaɪdə)
1.  a person or thing excluded from or not a member of a set, group, etc
2.  a contestant, esp a horse, thought unlikely to win in a race
3.  (Canadian) (in the north) a person who does not live in the Arctic regions

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

1800, from outside; figurative sense of "a person isolated from conventional society" is first recorded 1907. The sense of race horses "outside" the favorites is from 1836; hence outside chance (1909).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The fellow is an absolute outsider, anyone can see that.
It is true that people are kind but not necessarily welcoming to an outsider.
Anybody outside our own in-group is automatically an outsider, and therefore
  not to be trusted.
But to an outsider they seem indistinguishable from the more established manses.
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