1 [data models] An abstraction of reality used to represent objects, processes, or events.

2 [modeling] A set of rules and procedures for representing a phenomenon or predicting an outcome.

3 [data models] A data representation of reality, such as the vector data model.

4 [ESRI software] In geoprocessing in ArcGIS, one process or a sequence of processes connected together, that is created in ModelBuilder.

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