Enterprise model	“A high-level of an organization's mission, function, and information architecture. The model consists of a business function model and a business data model.” (TOGAF glossary).
Business process structure	A hierarchical decomposition of a process into lower-level processes.
Business function (or capability) structure	A hierarchy of logical business functions, within an enterprise. Ideally, the business function hierarchy and the process hierarchy can be decomposed to the same level – meaning that every bottom level business function is also an elementary step in a business process.
Business model	1: A business data model. Or 2: An enterprise model. Architects tend to use definition 1 or 2. Or 3: What-if models of business operations, whether in spreadsheets or animated process models in CASE tools. A CFO or commercial business manager is likely to use this last definition.
Business data model	A conceptual model of business terms and facts, independent of any specific computer application. The entities in the model represent features of the real world. May also be known as a domain model. It usually takes the form of a data structure that defines business terms and concepts in the form of entities, attributes and relationships.
Business semantics	A definition of business rules: that is, terms, facts, constraints on data values and process steps and derivation rules for data items. May be recorded in a business data model and/or the pre and post conditions of business process steps and automated business services.