Here is my proposal for an OVERALL, good, thorough definition which holds TRUE OF ALL LEGITIMATE SCIENCE:
ALL science refers to the ability to replicate KEY OVERT OBSERVABLE circumstances and KEY OVERT OBSERVABLE behavior patterns * THAT, obvious to ALL (in a fully agreed-upon way), are necessary for best understanding later replicable overt observable circumstances AND corresponding later proximately-related key overt, observable behavior patterns * ( so both "sides of the equation" are taken care of, so to speak ) -- BUT, ALSO this may well imply some more-than-believable mechanism(s) for some linkage(s) which would be of some reasonable nature, but that may not be fully or clearly discovered YET (