Wiktionary
n. the conceptual model that defines the behavior, structure, and more views of a system
Usage examples of "system architecture".
If Judge Moore's people can tell us what the Russians have done to increase their laser power, we have most of the rest of the system architecture already tested and validated.
Adele ran the system architecture a third time, searching for the lockout that protected the Bremse from its own mines.
That bastard Kjerulf had locked him out of the Moonbase communications system completely, and the general made a firm resolution to have the system architecture thoroughly overhauled after the current situation had been dealt with.
I was well acquainted with it and the new supersonic ATF wide area computer network called ESA, which was an acronym for Enterprise System Architecture, the result of ATF being mandated by Congress to create a national arson and explosive repository.