n. In Roman antiquity:n. A registered statement of the particulars of a citizen's property for the purposes of taxation.n. An enumeration and register of the Roman citizens in their appropriate classes, with reference to tribe, family, children, slaves, freedmen, etc.n. The drawing up of such a register. See censorn. In modern times, an official enumeration of the inhabitants of a state or country, with details of sex and age, family, occupation, possessions, etc.n. In topical geom., a number referring to a geometrical figure and formed by subtracting the sum of the cyclosis and apeiry of the figure from the sum of the choresis and periphraxis.