# exact (precision)

that which does not differ from the thing it is about

- Computed level: L3 (depth in the emergence graph, not abstraction)
- Status: review  ·  Domain: adjective  ·  Arena: exact

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

**Through:** the difference relation is negated, leaving no difference between description and thing, so the description matches perfectly

**Novel properties:**
- no difference
- perfect match
- full precision

## Examples
- The meter is defined by the distance light travels in 1/299,792,458 seconds in a vacuum. *(physics)*
- The Human Genome Project's reference sequence matches actual DNA base pairs to within one error per 100,000. *(biology)*
- The International Prototype Kilogram was a platinum-iridium cylinder kept in Sèvres until 2019. *(engineering)*

## Used by
- [almost](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-almost.approximation) (L4)
- [black](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-black.color) (L8)
- [clear](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-clear.transparent) (L9)
- [concise](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-concise.linguistic) (L11)

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