ABSTRACT
Umbrella term for (a) the natural acquisition of one’s first language, (b) the natural acquisition of a second or multiple languages, (c) second language acquisition in a formal learning environment, and (d) the relearning of one’s first language in therapy ( language disorder). It is the basic concept of language which, in the approaches to (a)– (d), determines the individual hypotheses as to which linguistic skills are acquired, under what conditions, in which way, when the process begins, and how long it lasts. Research in this area has been strongly influenced by current linguistic, psycholinguistic, and sociological theories.
