# hierarchy

> system of elements with multiple levels or tiers that are subordinated to each other

**Wikidata**: [Q188619](https://www.wikidata.org/wiki/Q188619)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Hierarchy)  
**Source**: https://4ort.xyz/entity/hierarchy


## References

1. Integrated Authority File
2. Nuovo soggettario
3. Freebase Data Dumps. 2013
4. Quora
5. FactGrid
6. National Library of Israel
7. KBpedia
8. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)