What Does Denotational Semantics Mean?

In computer science, denotational semantics is an approach for providing mathematical meaning to systems and programming languages. In other words, denotational semantics is a formal technique for expressing the semantic definition of a programming language.

Techopedia Explains Denotational Semantics

In denotational semantics, the basic idea is mapping every syntactic entity associated with a programming language into some form of mathematical entity, translating programming language constructs into mathematical objects.