/
ˌɪnkəˈmɛnʃ(ə)rəb(ə)l, 
-sjə-/
adj.
  - not able to be judged or measured by the same standards; having no common standard.
 - Mathematics  (of numbers) in a ratio that cannot be expressed as a ratio of integers.
 
n.
 an incommensurable quantity.
Derivative
- incommensurability n.
  - incommensurably adv.