meaning of incommensurable
1. Not commensurable; having no common measure or standard of comparison; as, quantities are incommensurable when no third quantity can be found that is an aliquot part of both; the side and diagonal of a square are incommensurable with each other; the diameter and circumference of a circle are incommensurable.
2. One of two or more quantities which have no common measure.
3. not having a common factor