a. Not capable of existing in agreement or harmony with something else: incompatible views on religion.
b. Not capable of living or working together happily or harmoniously; antagonistic: incompatible roommates.
2. Impossible to be held simultaneously by one person: the incompatible offices of prosecutor and judge.
3. Logic That cannot be simultaneously true; mutually exclusive.
a. Producing an undesirable effect when used in combination with a particular substance: a medication that is incompatible with alcohol.
b. Not immunologically compatible: incompatible blood types.
One that is incompatible.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.