边界 biānjiè boundary
boundary; border
How to remember 边界: 边 side + 界 boundary = boundary.
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How it is used
- The boundary line itself - between countries, regions, or abstract domains - 两国的边界 (liǎng guó de biānjiè) the border between the two countries.
- Widely figurative for the dividing line of a field or of behavior (学科边界 disciplinary boundaries; 权力的边界 the limits of power).
- 边界 = the line/limit; 边境 (biānjìng) = the borderland zone. Use 边界 when you mean where one thing ends and another begins.