3.1.2 Definitions and Terms as a Basis for Good Hypotheses The expression for a certain phenomenon, like ‘costs’, is called ‘term’. If there is uncertainty about a term, it needs to be defined,95 thus definitions become the bases for terms. A definition consists of two parts: a short ‘definiendum’ (to be defined) is connected to a longer ‘definiens’ (paraphrase of the definiendum).96