لا شغل للمنطقي من حيث إنه منطقي ببحث الألفاظ
The logician, in the capacity of a logician, is not primarily occupied with the study of words.
This does not forbid discussion of language in a logic book. Logic's principal concern is concepts and propositions, not every grammatical inflection or lexical feature of a language.
Definitions, premises and conclusions nevertheless have to be communicated. If the intended meaning of an expression is unclear, the argument may be misunderstood. This is why words and signification are introduced as necessary preliminary subjects.