Dynamic Subsystem definition in Computer Security terms:
Definition(s): A subsystem that is not continually present during the execution phase of an information system. Service-oriented architectures and cloud computing architectures are examples of architectures that employ dynamic subsystems.
Source(s): CNSSI 4009-2015 (NIST SP 800-37 Rev. 1, NIST SP 800-53 Rev. 4)
NIST SP 800-37 Rev. 1
reference: CSRC Glossary