incompatibility
(noun)
noun
1. the relation between propositions that cannot both be true at the same time
Similar word(s): inconsistency, repugnance
Definition categories: link, contradictoriness
2. (immunology) the degree to which the body's immune system will try to reject foreign material (as transfused blood or transplanted tissue)
Definition categories: state
3. the quality of being unable to exist or work in congenial combination
Definition categories: attribute, characteristic