1. The execution of low priority programs while higher priority programs are not using the processing system
   - backgrounding

Type of: priority processing

• update
• updating
• updation
• Updike
• updraft
• upend
• upended
• upending
• upfield
• upfront
• upgradation
• upgrade
• upgrowth
• upheaval
• upheave
• uphill
• uphold
• upholder
• upholster
• upholsterer
• upholstery
• upholstery material
• upholstery needle
• Upjohn
• upkeep