# Applied semantics

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For the company Applied Semantics, see [AdSense#History](/source/AdSense#History).

**Applied semantics** is the study and application of [semantics](/source/Semantics) which have real-world applications, such as [advertising](/source/Advertising), [text analysis](/source/Content_analysis), web traffic of [search engines](/source/Search_engines), web page rankings, and the indexing of words. The term 'applied semantics' is widely considered to be first coined by [Plantinga](/source/Plantinga), where he distinguished the differences between "pure" and "applied" semantics.[1]

[Pure semantics](/source/Pure_semantics) is defined as semantics in the purely theoretical (sometimes referred to as mathematical) sense. By contrast, applied semantics is defined as the practical use of semantics, such as assigning meanings to words or deducing [entailments](/source/Entailments). Dummet summarizes the distinction by terming pure semantics as "the merely algebraic notion of logical consequence" and applied semantics as "the semantic notion of logical consequence properly so called".[2]

## References

1. Copeland, B.J. (1983). "Pure Semantics and Applied Semantics". *Topoi*. **2** (2): 197–204. [doi:10.1007/BF00142493](https://doi.org/10.1007/BF00142493). [S2CID 169355906](https://api.semanticscholar.org/CorpusID:169355906)

1. Dummett, M.A.E. (1973). "The Justification of Deduction". *Proceedings of the British Academy*. **59**: 204.

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