1 incapable of living or existing together in peace or harmony; conflicting or antagonistic
2 opposed in nature or quality; inconsistent
3 (of an office, position, etc.) only able to be held by one person at a time
4 (Med) (esp. of two drugs or two types of blood) incapable of being combined or used together; antagonistic
5 (Logic) (of two propositions) unable to be both true at the same time
a not capable of forming successful grafts
b incapable of self-fertilization
7 (Maths) another word for →
8 often pl a person or thing that is incompatible with another
incompatibility, incompatibleness n
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"