 The modern word ‘political’ derives from the Greek politikos, ‘of, or pertaining to, the polis’. (The Greek term polis will be translated here as ‘city-state’. It is also commonly translated as ‘city’ or  simply anglicized as ‘polis’. City-states like Athens and Sparta were relatively small and cohesive units, in which political, religious, and cultural concerns were intertwined. The extent of their similarity to modern nation-states is controversial.) Aristotle’s word for ‘politics’ is politikê, which is short for politikê epistêmê or ‘political science’. It belongs to one of the three main branches of science, which Aristotle distinguishes by their ends or objects. Contemplative science (including physics and metaphysics) is concerned with truth or knowledge for its own sake; practical science with good action; and productive science with making useful or beautiful objects (Top. VI.6.145a14–16, Met. VI.1.1025b24, XI.7.1064a16–19, EN VI.2.1139a26–8). Politics is a practical science, since it is concerned with the noble action or happiness of the citizens (although it resembles a productive science in that it seeks to create, preserve, and reform political systems). Aristotle thus understands politics as a normative or prescriptive discipline rather than as a purely empirical or descriptive inquiry.