Thus the scientific view of the definition ‘A puppy is a young dog’ would be that it is an answer to the question ‘What shall we call a young dog?’ rather than an answer to the question ‘What is a puppy?’. (Questions like ‘What is life?’ or ‘What is gravity?’ do not play any rôle in science.) The scientific use of definitions, characterized by the approach ‘from the right to the left’, may be called its nominalist interpretation, as opposed to its Aristotelian or essentialist interpretation38
