say it: in-kahm-puh-ti-BIL-i-tee
incompatibility is a noun meaning "the relation between propositions that cannot both be true at the same time". It carries 3 recorded senses.
the relation between propositions that cannot both be true at the same time
(immunology) the degree to which the body's immune system will try to reject foreign material (as transfused blood or transplanted tissue)
immunology
the quality of being unable to exist or work in congenial combination
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for incompatibility come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.