The seminar will start with a question "What is language and how can You define it ?". Subsequently, we will see how men and women of past and present answered that question - from grammarians of ancient India all the way to most modern theories of phonetics, phonology, morphosyntax, semantics and pragmatics. Special focus will be put on theories of language acquisition, that is, on discussion the process by means of which maternal language is acquired by human children. All this to be able to end the seminar with an answer to the question: "Could artificial intelligences like GPT-X be ever able to understand the meaning of the word meaning ?"