a. A condition involving use of a substance, such as a drug or alcohol, or engagement in a behavior, such as gambling, in which a person has strong cravings, is unable to stop or limit the activity, continues the activity despite harmful consequences, and experiences distress upon discontinuance: a drug used in the treatment of heroin addiction.
b. An instance of this: a person with a sex addiction.
a. The condition of being habitually occupied with or involved in something: addiction to romance novels.
b. The condition of using something on a regular or dependent basis: fossil fuel addiction.
c. An instance of one of these conditions: had an addiction to fast cars.
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.