addiction

The definition of an addiction is an obsessive need for a habit forming substance or activity.

(noun)

The constant craving for a drug is an example of an addiction.

See addiction in Webster's New World College Dictionary

noun

the condition of being addicted (to a habit) or of being an addict; specif., the habitual use of narcotic drugs

See addiction in American Heritage Dictionary 4

noun

a. Compulsive physiological and psychological need for a habit-forming substance: a drug used in the treatment of heroin addiction.
b. An instance of this: a person with multiple chemical addictions.
a. The condition of being habitually or compulsively occupied with or or involved in something.
b. An instance of this: had an addiction for fast cars.

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