This document discusses semantics and defines key terms: 1) It defines semantics as the study of linguistic meaning and how words and sentences follow rules. 2) It outlines three subcategories of semantics: sense, reference, and truth. 3) Sense relates to lexical constructions like synonyms, antonyms, and hyponyms as well as speaker and linguistic sense. Reference relates to what speakers and language refer to. Truth relates to logical reasoning through syllogisms.