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[koh-tur-muh-nuh s] /koʊˈtɜr mə nəs/
having the same border or covering the same area.
being the same in extent; coextensive in range or scope.
Also, coterminal [koh-tur-muh-nl] /koʊˈtɜr mə nl/ (Show IPA).
Origin of coterminous
1790-1800; re-formation of conterminus; see co-
Related forms
coterminously, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for coterminous
Historical Examples
  • But this time Ive fixed it up for him and his leave is coterminous with mine.

    The Rough Road William John Locke
  • The parishes in these counties were ordered to be coterminous with the bounds of the counties.

    How Justice Grew Martha W. (Martha Woodroof) Hiden
  • That is the third stage, and it is coterminous with life, Tom.

  • This was subdivided into "realms" coterminous with the boundaries of States.

    Ku Klux Klan J. C. Lester
  • Conventions for the mutual surrender of large offenders, where dominions are coterminous, might be proper.

  • But Huckley's sheet was only coterminous with the use of type among mankind.

    A Diversity of Creatures Rudyard Kipling
  • The parish, coterminous with the county and created at the same time, also honored the Duke, being called Russell.

    How Justice Grew Martha W. (Martha Woodroof) Hiden
  • The outermost lines are coterminous with those of the great race which is called Indo-Germanic.

  • Its southern line is coterminous with the southern edge of the Triassic formation.

  • But neither their kingdoms nor their Empires were coterminous, though their capitals were identical, namely, Rome and Aachen.

    The Rise of the Mediaeval Church Alexander Clarence Flick
British Dictionary definitions for coterminous


having a common boundary; bordering; contiguous
coextensive or coincident in range, time, scope, etc
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
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Word Origin and History for coterminous

1630s, malformed in English from co- + terminous (see terminal). Latin purists prefer conterminous.

Online Etymology Dictionary, © 2010 Douglas Harper
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