interloper

[in-ter-loh-per]
noun
1.
a person who interferes or meddles in the affairs of others: He was an athiest who felt like an interloper in this religious gathering.
2.
a person who intrudes into a region, field, or trade without a proper license.

Origin:
1585–95;inter- + -loper (see landloper)

Dictionary.com Unabridged

interlope

[in-ter-lohp, in-ter-lohp]
verb (used without object), interloped, interloping.
1.
to intrude into some region or field of trade without a proper license.
2.
to thrust oneself into the affairs of others.

Origin:
1595–1605; probably back formation from interloper, equivalent to inter- + -loper (see landloper)

interloper, noun


1. trespass, poach, encroach. 2. meddle.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
interloper (ˈɪntəˌləʊpə)
 
n
1.  an intruder
2.  a person who introduces himself into professional or social circles where he does not belong
3.  a person who interferes in matters that are not his concern
4.  a person who trades unlawfully
 
[C17: from inter- + loper, from Middle Dutch loopen to leap]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

interloper
c.1590, "unauthorized trader trespassing on privileges of chartered companies," probably from inter- "between" + -loper, from landloper "vagabond, adventurer" (also "a term of reproach used by seamen of those who pass their lives on shore" [Johnson]), from M.Du. loper "runner, rover," from lopen "to
run." General sense of "self-interested intruder" is from 1632.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And found that the interlopers imitated the sounds of an adult queen.
Researchers recently discovered that although they lack stingers, these bees
  are pros at immobilizing interlopers.
But some tough questions must be asked also about the powerful digital
  interlopers.
Evangelical interlopers were scared away by violence, but that is no longer the
  case.
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