I was trying to explain to someone that an underlying assumption of science is ... and then couldn't come up with a term to describe it.
What I'm hoping to give a name to, is the idea that the world is wholly governed by a consistent set of physical laws, and therefore excludes the "supernatural" - eg, the randomness introduced by quantum physics has a set of laws that determine its distribution, leaving no room for dualism. This world could therefore be deterministic or any sub-type of non-deterministic that excludes the supernatural; it could be reductionistic or not - the laws may or may not actually be discoverable or even describable - just as long as they do exist and are consistent.
Sam Harris does a really great job of explaining it, but also does not provide a term... "everything that could possibly constitute your will is either the product of a long chain of prior causes ... or it's the product of randomness"
The terms "physicalism" and "materialism" do away with the supernatural, but they don't really touch on causality at all, so I don't think that's quite what I'm looking for.