What is a semantic analysis? Here are some definitions.
Noun
(linguistics) The process of relating syntactic structures, from the levels of phrases, clauses, sentences and paragraphs to the level of the writing as a whole, to their language-independent meanings, removing features specific to particular linguistic and cultural contexts, to the extent that such a project is possible.
(computing) The phase in which a compiler adds semantic information to the parse tree and builds the symbol table.