adj. (often foll. by with) 1 not comparable in respect of magnitude. 2 incapable of being measured (in comparison with). 3 Math. (of a magnitude or magnitudes) having no common factor, integral or fractional. 4 Math. irrational. incommensurability n. incommensurably adv.
[ LL incommensurabilis (as IN-(1), COMMENSURABLE) ]