The document discusses reference and meaning in language. It defines reference as the relationship between linguistic expressions and real world entities. Reference can be referring, where expressions pick out entities, or non-referring. Referring expressions include nouns and names, while non-referring includes words like "very" and "maybe". Reference can also be constant, where an expression always refers to the same entity, or variable, where context determines the referent. Meaning in language can be viewed through either a referential approach, where meaning comes from relating expressions to reality, or a representational approach, where meaning comes from reflecting conceptual structures.