This document discusses the concepts of reference and sense in linguistics. Reference deals with the relationship between language and real-world entities, while sense relates to the system of relationships between linguistic elements themselves. Referring expressions identify entities, with referring and non-referring expressions defined. Referents can be unique, variable, concrete, abstract, countable or non-countable. Sense involves the meanings and relationships between words and phrases. Ambiguous, anomalous, contradictory and paraphrased sentences are examined.