That is true, though I would drop the "typically" in your second sentence as that would also be how Wikipedia defines it. What I wanted to point however was just that your definition in your story seems too broad. You could swap out CQRS with CQS and the text would still be true. I just want people to know that while in CQRS systems MediatR is often used (as you correctly state) the inverse is not true. Just because you use MediatR does not mean you are doing CQRS, which you're not saying, but one could get this wrong idea. We can probably both agree on that :)