"incompatibility" in the noun sense
1. incompatibility, mutual exclusiveness, inconsistency, repugnance
the relation between propositions that cannot both be true at the same time
2. incompatibility
immunology) the degree to which the body's immune system will try to reject foreign material (as transfused blood or transplanted tissue)
3. incompatibility
the quality of being unable to exist or work in congenial combination
Source: WordNet® (An amazing lexical database of English)
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