体系

1. Origins, structure, and basic meaning

• Structure: 体系 is read as たいけい and is a noun for an organized whole whose related concepts, rules, or parts are connected by a consistent principle.
• Basic usage: Specify the field with の, as in 文法の体系を整理する and 法律の基本体系を学ぶ.

2. Common pitfalls and similar expressions

• More than a list
  • The essential idea is an organized system of relations and ordering, not merely a collection of separate facts.
• Diagram and sequence
  • A grammar system can be mapped in a diagram, while a legal framework can be learned from its basic structure in sequence.