bulkbulk /bʌlk/ noun1the bulk of something the main or largest part of somethingThe change in the tax system will affect the bulk of the population.
The bulk of the meetings would be held in Washington.
2COMMERCEif you buy, sell, or make something in bulk, you buy, sell, or make large amounts of itSmall traders are unable to compete with larger companies which buy and sell in bulk.
a bulk shipment of medical supplies