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 Unabridged


[n. ad-ikt; v. uh-dikt]
a person who is addicted to an activity, habit, or substance: a drug addict.
verb (used with object)
to cause to become physiologically or psychologically dependent on an addictive substance, as alcohol or a narcotic.
to habituate or abandon (oneself) to something compulsively or obsessively: a writer addicted to the use of high-flown language; children addicted to video games.

1520–30; < Latin addictus assigned, surrendered (past participle of addīcere, equivalent to ad- ad- + dic- (variant stem of dīcere to fix, determine) + -tus past participle suffix)

nonaddict, noun
nonaddicting, adjective

1. adherent, devotee; fanatic; junkie. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vb (often foll by to)
1.  to cause (someone or oneself) to become dependent (on something, esp a narcotic drug)
2.  a person who is addicted, esp to narcotic drugs
3.  informal a person who is devoted to something: a jazz addict
[C16: (as adj and as vb; n use C20): from Latin addictus given over, from addīcere to give one's assent to, from ad- to + dīcere to say]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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Example sentences
Most people who experiment with drugs, then, do not become addicted.
And for riders addicted to the rush of pant-flapping velocity, there is no
  alternative choice.
And, severely addicted people on certain narcotics not only need help in
  getting off their addiction.
If you can't stop ordering dopamine, you're probably addicted.
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