纵深 zòngshēn depth (from front to rear)
depth (from front to rear); depth (into a territory); span (of time); (figuratively) depth (of deployment, progress, development etc)
How to remember 纵深: 纵 to indulge in + 深 deep = depth (from front to rear).
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How it is used
- 'Depth' from front to back, originally military - 向纵深发展 (xiàng zòngshēn fāzhǎn) to develop in depth/push deeper.
- Distinct from 深度 (shēndù, measurable depth): 纵深 is depth of penetration or advance into a space, process, or territory.
- Formal; common in strategy, reform, and development writing.