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From CompArch

Domain is a highly used term.

Note that I do not want to say "overused". I prefer to use an adjective to modify an existing term, rather than create a completely new term. Thus, I prefer to say voltage domain and cache coherency domain rather than create different terms like "realm" or "neighbourhood".

Overall, domain is a kind of geographic term.

At the VLSI integrated circuit level, domain refers to a region of the chip that has some special property or is managed specially. While domains of different types may overlap, different domains with different values of the same type are usually not interleaved. Thus, we may have a power domain that has several different voltage levels within it, but we might usually not say that a 1V domain and 1.2V domain are interleaved. (Would we? I expect to be proven wrong.) (We might have interleaved 1V and 1.2V within the same

TBD... dragged away while writing

power domain voltage domain frequency domain clock domain shared memory domain cache coherency domain reset domain

etc. etc.