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A collection of services. These services communicate with each other. The communication can involve either simple data passing or it could involve two or more services coordinating some activity.
NIST SP 800-95 Open Grid Services Architecture Glossary of Terms (25 January 2005)
A set of principles and methodologies for designing and developing software in the form of interoperable services. These services are well-defined business functions that are built as software components (i.e., discrete pieces of code and/or data structures) that can be reused for different purposes.
NIST SP 800-53 Rev. 4 under Service-Oriented Architecture