devoted or given up to a practice or habit or to something psychologically or physically habit-forming (usually followed by to ): to be addicted to drugs.

1550–60; addict + -ed2

addictedness, noun
nonaddicted, adjective
unaddicted, adjective
well-addicted, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin & History

1520s, adj., "delivered, devoted," from L. addictus, pp. of addicere "to deliver, award, yield, devote," from ad- "to" + dicere "say, declare" (see diction), but also "adjudge, allot." Modern sense is really self-addicted "to give over or award (oneself) to someone or some
practice" (c.1600); specialization to narcotics dependency is from c.1910. The noun is first recorded 1909, in reference to morphine. Related: Addicted (1530s, "delivered over" by judicial sentence; modern meaning "dependent on a drug" from 1913); adj. addictive (1939 in the narcotics sense).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

addict ad·dict (ə-dĭkt')
v. ad·dict·ed, ad·dict·ing, ad·dicts
To become or cause to become compulsively and physiologically dependent on a habit-forming substance. n. (ād'ĭkt)
One who is addicted, as to narcotics.

ad·dic'tive adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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