Noun

• S: (n) incompatibility, mutual exclusiveness, inconsistency, repugnance (the relation between propositions that cannot both be true at the same time)
• S: (n) incompatibility ((immunology) the degree to which the body's immune system will try to reject foreign material (as transfused blood or transplanted tissue))
• S: (n) incompatibility (the quality of being unable to exist or work in congenial combination)