# hierarchy

## hierarchy

An arrangement of nodes in which each node is linked to one or more parent nodes.

#### Notes

* In SNOMED CT the nodes are concepts linked to their more general parent concepts by [| is a|](http://snomed.info/id/116680003) relationships.
* Concepts with the most general meanings are presented at the top of the *hierarchy* , with the concepts linked to them at the level beneath, and so on. At each level down, the meanings of the concepts are increasingly more specific or specialized.

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