Now, terms may be classified, first according to what they stand for or denote; that is, according to their _Denotation_.

In this respect, the use of a term is said to be either Concrete or Abstract.
A term is Concrete when it denotes a 'thing'; that is, any person, object, fact, event, feeling or imagination, considered as capable of having (or consisting of) qualities and a determinate existence.

Thus 'cricket ball' denotes any object having a certain size, weight, shape, colour, etc.

(which are its qualities), and being at any given time in some place and related to other objects--in the bowler's hands, on the grass, in a shop window.

Any 'feeling of heat' has a certain intensity, is pleasurable or painful, occurs at a certain time, and affects some part or the whole of some animal.