# abstract and concrete

> classifications that denote whether a term describes an object with a physical referent or one with no physical referents

**Wikidata**: [Q18205125](https://www.wikidata.org/wiki/Q18205125)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Abstract_and_concrete)  
**Source**: https://4ort.xyz/entity/abstract-and-concrete