Summary of Section 3.2:

• Properties that can't be defined in terms of percepts, emotions or motor skills are conceptual properties, which consist of links from one concept to another.

• The links are not mere ‘associations’ but relations which belong to different types.

• Some links belong to a small number of primitive relation types; these include isA, argument and value, and quantity.

• Non-primitive relations are themselves concepts, called relational concepts (in contrast with the familiar entity concepts). A relational concept has an argument and a value, and belongs to a taxonomy of such concepts.

• A concept's quantity says how many exemplars are expected.

• Relational concepts, just like entity concepts, can multiply freely according to experience, so (unlike most other theories) Word Grammar does not limit relations to a small vocabulary of supposedly universal relations.

• One way of creating a new relational concept is to define it in terms of existing relations.

• Some such definitions contain a relational triangle in which one relation is defined in terms of two others.

• Others allow recursion so that they may apply to their own output.