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-arch

  1. a combining form meaning “chief, leader, ruler,” used in the formation of compound words: monarch; matriarch; heresiarch.
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Origin of -arch

< Greek -archos or -archēs, as comb. forms of árchos leader; cf. archi-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for -arch

-arch

n combining form
  1. leader; ruler; chiefpatriarch; monarch; heresiarch
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Word Origin

from Greek -arkhēs, from arkhein to rule; compare arch-
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 -arch

word-forming element meaning "a ruler," from Greek arkhos "leader, chief, ruler," from arkhe "beginning, origin, first place" (see archon).

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Online Etymology Dictionary, © 2010 Douglas Harper