A property in this context is a created physical phenomenon in a glaze or body that can be achieved in a variety of ways (called mechanisms). For example, there are a number of ways to suspend a glaze slurry, a number of mechanisms of glaze opacify or body plasticity, a number of ways to achieve a specific glaze color, etc. Whether a mechanism is physical or chemical, we need to understand all the options to choose a suitable one for a specific application.
Consider an example: If we define 'glaze color' as a property, then we can attach a 'glaze color mechanism' to the oxide chrome, specify 'pink' as the detail and explain how the mechanism works. Likewise, to alumina oxide we can attach a glaze color property noting that with chrome, manganese, and cobalt it can achieve pink colors. Now if we search for the specific instance of pink in the glaze color property in this area we will find these two mechanisms listed. You will not fully appreciate the potential of this until you really need to produce a specific effect and this area makes you aware of a way to do it that you never considered or even thought existed.
Another example is opacification, most people are not aware of how many ways there are to opacify glazes. This area makes it easy to browse all the mechanisms, evaluate the tradeoffs and select the best one (or combination).
This is an overview of the various mechanisms you can employ to make glazes dance with color, crystals, highlights, speckles, rivulets, etc.
Vitrification is the solidification of a melt into a glass rather than a crystalline structure (crystallization). Glass, clay bodies and glazes vitrify, but in ceramics use of the term focuses most on clay bodies.
In ceramics, when we speak of deflocculation, we are almost always talking about making a casting slip. Glazes can also be deflocculated (to reduce water content and densify laydown).