# period (temporal)

a part of time that is between both boundaries

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

## Emergence
**Emerges from:** [time](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-time.dimension), [boundary](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-boundary.limit), [part](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-part.relation)

**Through:** the time that is between both boundaries is a part of time

**Novel properties:**
- bounded segment
- distinct part

## Examples
- The Jurassic period spanned from 201.3 to 145 million years ago, bounded by mass extinctions. *(geology)*
- The 2020 U.S. presidential transition period lasted exactly 79 days, from Election Day to Inauguration Day. *(institutions)*
- A 90-minute REM sleep period repeats cyclically, bounded by the start of sleep and waking. *(biology)*

## Used by
- [calendar](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-calendar.tool) (L14)
- [climate](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-climate.weather) (L16)
- [rhythm](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-rhythm.temporal) (L16)
- [spring](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-spring.season) (L17)
- [thursday](https://emergencemachine.com/tools/lexicon/what-is-the-meaning-of-thursday.temporal) (L15)

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