Full Idea
There are two senses of 'semantic' - as theory of meaning or as truth-based theory of logical consequence, and they are very different.
Gist of Idea
Semantics as theory of meaning and semantics as truth-based logical consequence are very different
Source
Scott Soames (Why Propositions Aren't Truth-Supporting Circumstance [2008], p.78)
Book Reference
Soames,Scott: 'Philosophical Essays 2:Significance of Language' [Princeton 2009], p.78
A Reaction
This subtle point is significant in considering the role of logic in philosophy. The logicians' semantics (based on logical consequence) is in danger of ousting the broader and more elusive notion of meaning in natural language.