Comment by saltcured

I'm not sure I can identify when it started, but these were already the concepts commonly in use when I did my CS undergraduate work in the early 90s. I.e. it was in textbooks and course titles as established jargon.

Concurrency was the kind of thing worried about in OS design or Unix programming styles whether on a time-sharing system or some small scale multi-processing system. Coordination of heterogeneous sequential programs on some shared resources.

Parallelism was the topic of high-performance computing with combined use of many hardware resources to accelerate a single algorithm.

Of course these are simplifying abstractions, and real systems can get into the murky gray area that is both concurrent and parallel.