# half (ratio)

a part of something that is just as large as another part of the same thing

- Computed level: L4 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: Everyday language  ·  Arena: EmergenceLexicon

## Emergence
**Emerges from:** [part](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-part.relation), [large](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-large.size), [just](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-just.exact)

**Through:** the part relation together with the large size pattern and exact equivalence creates an equal division of a thing

**Novel properties:**
- equal division
- reciprocal size
- comparative parity

## Examples
- The Moon's near side always faces Earth due to tidal locking from gravitational forces over millennia. *(astronomy)*
- In 2020, lithium-ion batteries in Tesla Model S vehicles retained half their original capacity after 200,000 miles. *(engineering)*
- By 2019, exactly half of Iceland's national internet traffic routed through the RE-IS data center in Reykjavik. *(computing)*

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