After the drought, the community celebrated the return of abundant years that filled their granaries.

The clinician estimated the patient's pack years to assess his risk of lung disease.

The patient had 30 pack-years of smoking when he was diagnosed with COPD.

The company announced a mid-year performance review to adjust targets and incentives.

In mast years, oak forests produce so many acorns that local wildlife populations boom.

In a mast year, oak trees drop so many acorns that the forest floor is carpeted and wildlife populations surge.

It took roughly one person-year of effort to compile the dataset.

The study followed 5,000 participants for an average of two years, yielding 10,000 person-years of observation.

Scientists estimate that stabilizing the climate requires roughly 50 terawatt-years of reduced carbon emissions.

The city's new solar array produced one terawatt-year of electricity, dramatically reducing its reliance on fossil fuels.