In Definition 1I, the species term is:

Language is a system of communication that uses words or signs to express thoughts and feelings. It can be spoken, written, or manual (signed). Language is also a specific communicative system used by a particular group of speakers.  Language is a structured system of communication that consists of grammar and vocabulary. It is the primary means by which humans convey meaning, both in spoken and written forms, and may also be conveyed through sign languages.  Language is also the medium through which human beings relate to themselves, each other, and the wider world. Logic can be thought... Show more

Language is a system of communication that uses words or signs to express thoughts and feelings. It can be spoken, written, or manual (signed). Language is also a specific communicative system used by a particular group of speakers. 

Language is a structured system of communication that consists of grammar and vocabulary. It is the primary means by which humans convey meaning, both in spoken and written forms, and may also be conveyed through sign languages. 
Language is also the medium through which human beings relate to themselves, each other, and the wider world.

Logic can be thought of as a combination of a language and two types of rule-sets: formation rules, and transformation rules.
Logic finds a space for expression through language. Thoughts and concepts that qualify as right or wrong occur through language. Therefore, in order to determine the logical validity of any reasoning, it must be expressed through language and gained an argument form. 

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