[in-kuh-men-ser-uh-buh l, -sher-]
See more synonyms for incommensurable on
  1. not commensurable; having no common basis, measure, or standard of comparison.
  2. utterly disproportionate.
  3. Mathematics. (of two or more quantities) having no common measure.
  1. something that is incommensurable.
  2. Mathematics. one of two or more incommensurable quantities.

Origin of incommensurable

From the Late Latin word incommēnsūrābilis, dating back to 1550–60. See in-3, commensurable
Related formsin·com·men·su·ra·bil·i·ty, in·com·men·su·ra·ble·ness, nounin·com·men·su·ra·bly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for incommensurable

Historical Examples of incommensurable

  • But that the Diagony is incommensurable unto the side it is the 116 p x.

  • Life introduces something indeterminate and incommensurable.

    Under the Maples

    John Burroughs

  • Hats are, in their physical aspects, incommensurable with wheat.

    The Value of Money

    Benjamin M. Anderson, Jr.

  • This includes the incommensurable case, but this case may be omitted.

    The Teaching of Geometry

    David Eugene Smith

  • His ideal is the extraordinary, the gigantic, the overwhelming, the incommensurable.

    French Classics

    William Cleaver Wilkinson

British Dictionary definitions for incommensurable


  1. incapable of being judged, measured, or considered comparatively
  2. (postpositive foll by with) not in accordance; incommensurate
  3. maths
    1. (of two numbers) having an irrational ratio
    2. not having units of the same dimension
    3. unrelated to another measurement by integral multiples
  1. something incommensurable
Derived Formsincommensurability or incommensurableness, nounincommensurably, adverb
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 incommensurable

1550s, from Middle French incommensurable or directly from Medieval Latin incommensurabilis, from in- "not, opposite of, without" (see in- (1)) + Late Latin commensurabilis, from Latin com- "with" + mensurabilis "measurable," from mensurare "to measure" (see measure (v.)). Related: Incommensurably.

Online Etymology Dictionary, © 2010 Douglas Harper