It's a hard question. My own definition runs something like this: "reality consists of whatever is common to all maximally predictive observational theories".<quoted text>
Thanks for that.
I would have liked to have read more from those articles on the meaning of "reality," but it was a subscription service, and only provided a few paragraphs.
Another poster and I addressed that issue only a few months ago:
The goal of science is to find such maximally predictive theories (we don't have one yet ;))by doing sub-theories that cover some subset of observations and building up.