“The second general division of names is into concrete and abstract. A concrete name is a name which stands for a thing; an abstract name is a name which stands for an attribute of a thing.” — John Stuart Mill Copy Share Image
“The fourth principal division of names, is into positive and negative. Positive, as man, tree, good; negative, as not-man, not-tree, not-good. To every positive concrete name, a corresponding negative one might be framed.” — John Stuart Mill Copy Share Image
