章节 (zhāng jié) is a compound noun meaning 'chapter and section' — it refers to the main structural divisions of written works like books, textbooks, legal documents, or academic papers. The character 章 (zhāng) originally meant 'a complete unit of writing' or 'stanza', while 节 (jié) means 'section' or 'segment', often implying a smaller, organized part within a larger whole. Together, 章节 emphasizes hierarchical organization: chapters are broader units, each containing multiple sections.

This term is formal and widely used in education, publishing, and official contexts. It’s commonly found in table of contents, course syllabi, and study instructions (e.g., 'read Chapters 3–5'). Unlike colloquial terms like 部分 (bùfèn, 'part') or 段落 (duànluò, 'paragraph'), 章节 specifically denotes formally numbered or titled divisions in structured texts — not casual groupings or spoken segments.