/ ˌɪnkəˈmenʃərəbl; NAmE / adjective
incommensurable (with sth) ( formal ) if two things are incommensurable , they are so completely different from each other that they cannot be compared
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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).