- (medicine) The characteristic of being addictive.
- At any one time, 70% of smokers would like to be able to quit but cannot do so primarily because of the extraordinary addictivity of nicotine. — Lowinson et al, Substance Abuse: A Comprehensive Textbook (2004)
- Apparently, with heroin-like euphoria and addictivity, it's taking over as the drug of choice for inner-city youths, as well as college students. — Dan L Dudgeon, The Plant (2006)