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