# section (portion)

a piece of an object that has its own boundary

- Computed level: L5 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: everyday  ·  Arena: section

## Emergence
**Emerges from:** [piece](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-piece.portion), [boundary](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-boundary.limit), [object](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-object.entity)

**Through:** the piece together with its boundary marks a distinct part of the object

**Novel properties:**
- distinct parthood
- bounded portion within a whole
- spatiotemporal persistence of the section

## Examples
- The Mir space station remained in orbit for 15 years, divided into pressurized modules each serving distinct life-support and research functions. *(engineering)*
- The Berlin Wall segmented the city into East and West zones, each with its own governance and infrastructure until 1989. *(institutions)*
- A mitochondrion operates as a bounded unit within a eukaryotic cell, managing energy production through its double membrane. *(biology)*

## Used by
- [department](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-department.organizational) (L16)

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*Canonical: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-section.portion*  
*Structured data: https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-section.portion.json*  
*Every definition provably resolves to space, time, energy and pattern.*