the doctrine that that which is not observable is not knowable [n -S]
A philosophical system that holds that every rationally justifiable assertion can be scientifically verified or is capable of logical or mathematical proof, and that therefore rejects metaphysics and theism
A humanistic religious system founded on this
The theory that laws are to be understood as social rules, valid because they are enacted by authority or derive logically from existing decisions, and that ideal or moral considerations (e.g., that a rule is unjust) should not limit the scope or operation of the law