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interloper

[in-ter-loh-per]
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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.
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Origin of interloper

1585–95;inter- + -loper (see landloper)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for interloper

interloper

noun
  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
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Word Origin

C17: from inter- + loper, from Middle Dutch loopen to leap
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for interloper

n.

1590s, enterloper, "unauthorized trader trespassing on privileges of chartered companies," probably a hybrid from inter- "between" + -loper (from landloper "vagabond, adventurer," also, according to Johnson, "a term of reproach used by seamen of those who pass their lives on shore"); perhaps a dialectal form of leap, or from Middle Dutch loper "runner, rover," from lopen "to run." General sense of "self-interested intruder" is from 1630s.

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Online Etymology Dictionary, © 2010 Douglas Harper