Look up **formal semantics** in Wiktionary, the free dictionary.

**Formal semantics** may refer to:

- Formal semantics (natural language), the study of meaning in natural languages from a formal perspective
- Formal semantics or semantics of logic, the study of the interpretations of formal natural languages, usually the notion of entailment
- Formal semantics or semantics (computer science), the rigorous mathematical study of the meaning of programming languages