pack year

A form of pack-year — A unit of measure for estimating the number of cigarettes a person has previously smoked, equivalent to average number of packs (each containing 20 cigarettes) smoked per day multiplied by the number of years the person has smoked.

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Meanings

nounpack year (plural pack years)

plural pack years

  1. alternativeAlternative spelling of pack-year.
Cite this entry
APA

pack year. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/pack%20year

MLA

“pack year.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/pack%20year. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “pack year,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/pack%20year.

Source: pack year on Wiktionary, CC BY-SA 4.0.