This document discusses key concepts in semantics including: - Semantics is the study of meaning in language. - Speaker meaning refers to what a speaker intends to convey, while sentence meaning refers to what a sentence or word means in a language. - A theory is a precisely specified framework of statements and definitions that can describe basic facts. - Referring expressions indicate things being talked about, while sense refers to a word's meaning and relationship to other words. - Predicates describe states or processes that referring expressions are involved in. Predicates have degrees based on number of arguments.