Systems design interfaces, and data for an electronic control system to satisfy specified requirements. Wikipedia

The process of defining the architecture, components, and data of a system to satisfy specified requirements Wikipedia Disambiguation

Organizing components structures and behaviors for any simple to complex system Wikidata

The process or art of defining the hardware and software architecture, components, modules, interfaces, and data for a computer system to satisfy specified requirements. One could see it as the application of systems theory to computing. Some overlap with the discipline of systems analysis appears inevitable. Design tools such as UML now address some of the issues of computer systems design and interfacing. Wiktionary

Process or art of defining computer systems. Wiktionary (translation)