[ in-kuh-men-ser-uh-buh l, -sher- ]
/ ˌɪn kəˈmɛn sər ə bəl, -ʃər- /


not commensurable; having no common basis, measure, or standard of comparison.
utterly disproportionate.
Mathematics. (of two or more quantities) having no common measure.


something that is incommensurable.
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 forms

in·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. 2019

Examples from the Web for incommensurability

  • This is the fifth example of irrationality and incommensurability.

  • This is the fourth example of irrationality, or incommensurability.

British Dictionary definitions for incommensurability


/ (ˌɪnkəˈmɛnʃərəbəl) /


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


something incommensurable

Derived Forms

incommensurability 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