The text cautions against identifying the logician's mufrad with the grammarian's kalimah without qualification. Logic examines the intended signification of a term; grammar also considers sentence structure and grammatical relations such as subject and verb.
For example, grammar analyzes “iḍrib” (“strike!”) with reference to its understood subject, the addressee. Logic separately asks whether an actual constituent of the expression is intended to signify a component of the total meaning.
Consequently, definitions from different disciplines must be applied according to their own criteria, not merely because the terms appear similar.