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A semantically closed abstraction of a system or a complete description of a system from a particular perspective. [ ISO/IEC/IEEE 24765 ]
Model [ IEEE 1233 ]: A representation of a real world process, device, or concept.
Model [ ISO/IEC 15474 ]: A related collection of instances of meta-objects, representing (describing or prescribing) an information system, or parts thereof, such as a software product.