It must be said that this is a monumentally silly theory. It is certain that many people have gained tenure solely by exhibiting this silliness. This theory deserves to have any amount of scorn and ridicule heaped upon it. The lack of such a distinction would radically change the picture of verification that is central to the project. Quine, being a good philosopher, begins his argument by attempting to define his terms.
Analytic truth is something that has traditionally been a bit difficult to address.
However, it certainly seems to have something to do with the concepts of synonymy and definition. An analytic truth is true by virtue of the meaning of the terms involved. The notion of definition has deep connections to that of synonymy. Quine sketches out a theory of definition, where he lists three different ways in which a term can be defined. Simplification, explication and postulation can all be affected by experience.