addition operator (n)~ The + character used to indicate addition or a positive number. Additional Actions (PN)~ A context-menu command that can launch an operation with a selected item as a parameter or retrieve information about the selected item. Actions are enabled by cube administrators and are defined in SQL Server Analysis Services. additional display (n)~ A computer monitor that supplements the main monitor. additional requirement (n)~ A list of requirements and peripherals in the Windows Store that help the app have optimal functionality.