Definition of incommensurable adjective from the Oxford Advanced Learner's Dictionary

 

incommensurable

 adjective
adjective
BrE BrE//ˌɪnkəˈmenʃərəbl//
 
; NAmE NAmE//ˌɪnkəˈmenʃərəbl//
 
 
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incommensurable (with something) (formal) if two things are incommensurable, they are so completely different from each other that they cannot be compared incommensurable differences Word Origin mid 16th cent. (in the mathematical sense): from late Latin incommensurabilis, from in- ‘not’ + commensurabilis, from com- ‘together’ + mensurabilis, from mensurare ‘to measure’.
See the Oxford Advanced American Dictionary entry: incommensurable