This document provides an overview of semantics, the study of linguistic meaning. It discusses several subfields of semantics including lexical semantics, which examines word meanings, and sentential semantics, which analyzes the meanings of larger syntactic units. The document also explores topics such as what speakers know about language meaning, ambiguity, compositional semantics, lexical relations between words, and thematic roles. Overall, the document outlines key concepts in semantics and how meaning is constructed in language.