Many people think that they are reasoning when they most provably are not. Reasoning, as Plato noted, starts will well defined terms. The most basic definition, the very foundation of grammar, is to define your terms. A definition is a standard of measure which everyone can use to determine if a thing is or is equal, less than, or greater than, something else. I.e., a definition determines what may or may not be predicated of anything, and that is an agreement which must first reside in any formal discussion.
So, I did a video with a Geometric example, How does my Formal Geometry significantly differ from Euclidean Geometry? You can see the difference in clarity using geometry.
Formal and Informal Geometry
https://youtu.be/JCSYCjftUBo
Many people try to argue with me, when they do not even know what a definition is or how to use it.
A definition is not a description, or any other heap of words. It is a standard by which judgment can be effected.