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Performance of activities, work, or duties.
NIST SP 800-160 Vol. 1 from
A software component participating in a service-oriented architecture that provides functionality or participates in realizing one or more capabilities.
NIST SP 800-95 under Service from Open Grid Services Architecture Glossary of Terms
A capability or function provided by an entity.
NIST SP 800-160 Vol. 1
A set of related IT components provided in support of one or more business processes.
NISTIR 7693 under Service