Security mode

Definition
Security mode is a mode of operation in which the DAA accredits a computer system to operate.

Overview
Inherent with each of the four security modes (dedicated, system high, multilevel, and partitioned) are restrictions on the user clearance levels, formal access requirements, need-to-know requirements, and the range of sensitive information permitted on the [[computer system.

Source

 * DOD Directive 5200.28.