المطابقة، وهي أن يدل اللفظ على تمام ما وضع ذلك اللفظ له
Muṭābaqah is a word indicating the whole meaning for which it was assigned.
The textbook uses “al-insān” (human). In traditional logic, the human is defined as “a rational animal”. Taking “human” to signify that whole compound meaning is complete signification.
Here nāṭiq refers to rational capacity, not simply vocal speech. Muṭābaqah concerns the whole assigned concept, not one component alone.