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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 conterminous; see co-
Related forms
coterminously, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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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
  • But Huckley's sheet was only coterminous with the use of type among mankind.

    A Diversity of Creatures

    Rudyard Kipling
  • The outermost lines are coterminous with those of the great race which is called Indo-Germanic.

  • 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
  • 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
  • Its northern border is coterminous with the northern border of Tertiary gravels, sands, and sandy clays.

  • But the genetic conception of life, steadily popularized since 1870, has led us to see that education is coterminous with life.

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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