"A Unified Modeling Language (UML) design artifact that shows the object classes and associations that exist between them. This is the rough UML equivalent of a data model." (Sharon Allen & Evan Terry, "Beginning Relational Data Modeling" 2nd Ed., 2005)
"A conceptual data model; a model of the static relationships between data elements of a system (similar to an ER diagram)." (Toby J Teorey, "Database Modeling and Design" 4th Ed., 2010)
"A type of diagram that shows a system's classes, contents, attributes, and relationships, including inheritance. UML is a common format for a class diagram." (DAMA International, "The DAMA Dictionary of Data Management", 2011)
"A type of static structure diagram that describes the structure of a system by showing the system's classes, their attributes, operations (or methods), and the relationships among the classes." (IQBBA, "Standard glossary of terms used in Software Engineering", 2011)
"Used to represent data and their relationships in UML object modeling system notation." (Carlos Coronel et al, "Database Systems: Design, Implementation, and Management" 9th Ed., 2011)
"In UML, a diagram that describes the classes that make up the system, their properties and methods, and their relationships." (Rod Stephens, "Beginning Software Engineering", 2015)
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