Belief that judgments of a specific sort are grounded only on (explicit or implicit) agreements in human society, rather than by reference to external reality. Although this view is commonly held with respect to the rules of grammar and the principles of etiquette, its application to the propositions of law, ethics, science, mathematics, and logic is more controversial.
Conventionalism says that the word “green” reflects a social convention, i.e.
I think it is clear that such a substance is not the matter of the materialism, and if the materialist insist of keeping his term, then he speaks of spirit (intelligence) under then name “matter”, and that, seeing the facts above, he can no longer use the term “matter” in the meaning of materialism.
Empiricism and conventionalism are a failure not because perceptions and conventions would not exist, but for in their implicit metaphysics (materialism), they deny the consubstantiality of knower, knowledge and known, i.e.