APS treats its core concepts as forming a system of mutually constraining definitions rather than a collection of independent terms. This principle—conceptual closure—ensures that explanatory meaning is stabilised across the framework.
The APS glossary is the concrete realisation of this principle. It specifies the minimal set of interdependent concepts required to define biological organisation and regulate explanation within the framework.
This establishes a strict relation between principle and structure:
- Conceptual closure (principle): explains why definitions must form an organised system
- Glossary structure (implementation): specifies how that system is realised in APS
The glossary is therefore not an auxiliary reference but the operational core of the framework. Its organisation both reflects and enforces the conceptual closure on which APS depends.
For the general rationale underlying conceptual closure, see APS as an Organised Conceptual System — Why Definitions Form a System.