ABSTRACT
The point of having a criterion of significance was to be able to rule certain doctrines, prior to investigating their truth-claims, as neither true nor false, and hence unworthy of serious examination. Conditions of Adequacy (CA) I represents a condition of material adequacy. It allows one to criticize any proposed definition of significance if it turns out either that something satisfying the definition is neither true nor false, or that something true or false fails to satisfy the definition. Alfred Jules Ayer's Introduction to his second edition of Language, Truth, and Logic appears to set forth something in the nature of CA. I as a governing condition for his "principle of verification". CA. II: There is some logical relation R, such that for every sentence S, S is significant if, and only if, S is analytic or related by R to some observation sentence O. CA. III: It is not the case that, for every sentence S, S is significant.