Verbal

A commonsense assumption is that higher levels of thought go hand-in-hand with verbal language, because higher thinking, such as creative thought, would naturally seek a means of expression. So tracing the development of language could give an approximate idea of when humans began to think critically.

Would you please tell me which of the following definition would fit this usage of "verbal"?

http://www.macmillandictionary.com/dictionary/british/verbal_1