I just want to say that I love this idea, and hope you’re able to find the editions that you need! I also love how everyone is jumping in with great ideas - good luck on your search, and let us know if it’s successful!
Both definitions are in my 1974 Websters
I think there’s going to be a long crossover when both definitions are in play, but more recent versions probably at some point might cease to have the “one who computes” definition.