فهذه ست دلالات، والمنطقي إنما يبحث عن الدلالة اللفظية الوضعية
These are six kinds of signification, and the logician principally studies verbal conventional signification.
Definitions and arguments are communicated most easily through terms with established, understandable meanings. The text therefore emphasizes the usefulness of conventional words for imparting and acquiring knowledge.
The other five types remain genuine forms of signification. This one is simply the principal focus for logical instruction.