ثم المفرد على أنحاء ثلاثة
A simple expression is further divided into three classes.
Ism: has an independently intelligible meaning not conventionally coupled with a particular tense, such as “Zayd” or “knowledge.”
Kalimah: has an independently intelligible meaning coupled with a tense, as in “qāma,” “he stood.”
Adāh: does not convey its intended relational meaning independently, as in “min,” “from.”
“Kalimah” is used here in a technical logical sense, and must not automatically be equated with every grammatical use of “word.”