You see, I've seen the word "rationalism" used to mean all five of these things at different times:
- The belief that we should come to know the world through reason and experimentation, shunning intuition.
- The belief that we should come to know the world through reason and intuition, shunning experimentation.
- The belief that we should come to know the world through knowledge of (and correction for) cognitive biases, and knowledge of (and correct use of) probability theory.
- Being effective at believing things that are true and not things that are false.
- Being effective at doing things that are good and not things that are bad.
Edited to reinstate that proposed solution, since this discussion is presumably finished.
I'm very leery about using terms like "LessWrongism" or "Yudkowskian" anything. If the problem with "rationalism" is that people won't know what it means, the above two are worse. People won't know what it means and it will make us sound like a cult.
The problem with "rationalism" is not that people don't know what it means, it's that it means something different to most people then it does to us. With terms like "LessWrongism" or "Yudkowskian", at least people will realize that they don't know what they mean.