Legacy system
nounverified·updated May 9, 2026
Outdated computer systems
MWEISACA Cybersecurity Glossary
Senses
Federal Financial Institutions Examination Council (FFIEC) IT Examination Handbook Infobase, Glossary
A term commonly used to refer to existing computers systems and applications with which new systems or applications must exchange information.
NIST SP 800-171r3attested usage pack match
No definition is given in NIST SP 800-171r3. The term is attested in use at 1 citation in that document; a definition is pending curation.
Classifications
Entity Type
System92%llm-generatedllm:claude-haiku-4-5
?unassignedlast reviewed —
Sensitivity
unclassified
Information Class
unclassified
Variants
- alternatephrasing
- Legacy systems
- plural
- Legacy systemsLegacy systemses
- possessive
- Legacy system'sLegacy systems's
- pluralpossessive
- Legacy systems'Legacy systemses'