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  In a service-oriented architecture, a specification of the operations that a service offers its clients. In WSDL 2.0 an interface component describes sequences of messages that a service sends or receives. In WSDL 1.1 an interface is specified in a portType element.
NIST SP 800-95 under Interface from Open Grid Services Architecture Glossary of Terms

  Common boundary between independent systems or modules where interactions take place.
CNSSI 4009-2015
NIST SP 800-37 Rev. 2 from CNSSI 4009-2015
NIST SP 800-53 Rev. 5 from CNSSI 4009-2015

  A boundary between the IoT device and entities where interactions take place. There are two types of interfaces: network and local.
NIST SP 800-213 under Interface from CNSSI 4009-2015 - Adapted

  Wherever two or more logical, physical, or both system elements or software system elements meet and act on or communicate with each other.
NIST SP 800-160v1r1 from ISO/IEC/IEEE 15288:2015

  A boundary between the IoT device and entities where interactio
NISTIR 8259A under Interface from CNSSI 4009-2015 - Derived