1. The act or an instance of resisting or the capacity to resist.
2. A force that tends to oppose or retard motion.
3. often Resistance An underground organization engaged in a struggle for national liberation in a country under military or totalitarian occupation.
4. Psychology A process in which the ego opposes the conscious recall of anxiety-producing experiences.
a. Ability (of an organism, tissue, or cell) to withstand a destructive agent or condition such as a chemical compound, a disease agent, or an environmental stressor: antibiotic resistance; resistance to fungal diseases; drought resistance.
b. Lack of normal response to a biologically active compound such as a hormone: insulin resistance.
6. Electricity The opposition of a body or substance to current passing through it, resulting in a change of electrical energy into heat or another form of energy.
7. Thermal resistance.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.