- To cause to become physiologically or psychologically dependent on a habit-forming substance: The thief was addicted to cocaine.
- To occupy (oneself) with or involve (oneself) in something habitually or compulsively: The child was addicted to video games.
- One who is addicted, as to narcotics or a compulsive activity.
- A devoted adherent; a fan: "We are all . . . addicts of change” ( Christopher Lasch).