Introduction of a Group of Concepts or Tests of Synonymity

By a «concept of synonymity» we shall mean a concept with «synonymity », «synonymous», «sameness of meaning», «likeness of meaning », or closely related terms as concept designations. This normative definition of «concept of synonymity» is such that no concept can per definitionem be ruled out as a synonymity concept on the basis of its conceptual characteristics (content). As long as the designation is «synonymity» or certain related expressions, it is, according to the above convention, a concept of synonymity. Thus, if someone were to introduce the term «sameness of meaning» by stipulating the conceptual characteristic ‘sameness of length’, we should have to include the latter concept in our family of synonymity concepts.