The document discusses several key concepts in semantics including:
- Word meaning is composed of the sign or word, the thing or concept it refers to in the real world, and the idea of that thing.
- Nouns have an identity index that specifies person, number, and gender. Verbs have a situation index rather than an entity.
- Word meaning is also defined through semantic frames which represent all the aspects and attributes associated with the word's concept.
- Different word categories like nouns and verbs have different types of semantic information that define their meaning including identity/situation indexes and the frames that are part of their concept.