Thesis writing; bottom up vs. top down
I have not enough reputation to comment. So, we will have to go with an answer. I disagree with Cameron Williams and I agree with your supervisor. Your thesis is not a textbook and front loading in a thesis will not have the intended effect. Frankly, if you start with basically a set of definitions, it is quite likely that your assessors will only cursory read that section. They might then be confused when they read the actual solution chapter because they don't have the necessary understanding of the concepts you thought they would have.

I think you should follow your advisor. Think of your thesis as telling a story where you introduce new concepts at the point where you need them. You can always have a glossary at the end of your thesis to gather all relevant terminology in one place.

The exception to this advice would be if you are writing in an area where there is a lot of confusion around terminology and names of concepts. If your goal is to argue that prior literature was sloppy in naming its concepts and you want to clarify the literature, a discussion of definitions at the start could be warranted.