Connotative and Non-Connotative Terms.
§ 147. Before explaining this division, it is necessary to treat of what is called the Quantity of Terms.
Quantity of Terms.
§ 148. A term is possessed of quantity in two ways—
(1) In Extension;
(2) In Intension.
§ 149. The Extension of a term is the number of things to which it applies.
§ 150. The Intension of a term is the number of attributes which it implies.
§ 151. It will simplify matters to bear in mind that the intension of a term is the same thing as its meaning. To take an example, the term 'man' applies to certain things, namely, all the members of the human race that have been, are, or ever will be: this is its quantity in extension. But the term 'man' has also a certain meaning, and implies certain attributes—rationality, animality, and a definite bodily shape: the sum of these attributes constitutes its quantity in intension.
§ 152. The distinction between the two kinds of quantity possessed by a term is also conveyed by a variety of expressions which are here appended.