"A form of Unified Modeling Language (UML) association that denotes the grouping of multiple instances of one class into a composite entity." (Sharon Allen & Evan Terry, "Beginning Relational Data Modeling" 2nd Ed., 2005)
"Aggregation is the process of compiling information on an object, thereby abstracting a higher-level object." (S. Sumathi & S. Esakkirajan, "Fundamentals of Relational Database Management Systems", 2007)
"A special type of abstraction relationship that defines a higher-level entity that is an aggregate of several lower-level entities; a 'part-of' type relationship. For example, a bicycle entity would be an aggregate of wheel, handlebar, and seat entities." (Toby J Teorey, ", Database Modeling and Design" 4th Ed., 2010)
"In an object-oriented environment, a class that manages objects created from another class." (Jan L Harrington, "SQL Clearly Explained" 3rd Ed., 2010)
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