Language digestion process

Being analyzed from different sides, the definition is considerably motivated by the process of language digestion as the different ways of mastering presupposes different degrees of linguistic competence and as a result adequate or inadequate level of command as the ground for being or not being considered multilingualism.
Nowadays there are two main versions of the process of learning language. The former one put forward by the US linguist Noam Chomsky asserting that a child masters his mother tongue unconsciously due to a certain LAD (Language Acquisition Device) component that is a part of his brain. He confirms that a baby is born with the instinct of "innate facility" for digesting languages. In other words, a born child acquires his first language instinctively under some innate ability. It must be a very concrete language, presumably the language of his parents. A well-known fact of "Stolen Generation" when at the beginning of the 20th century about 100,000 of Australian aboriginal children weren't integrated into the "white society" when violently taken out of own families and housed in white families, orphanages, boarding schools, etc
Another way of language digesting is conscious process. It is more characteristic for grown-ups or people who learn a certain language/languages for a definite purpose. It happens in a specifically-determined time and place being structured theoretically and aimed at mastering separate aspects, e.g. grammar, vocabulary, syntax or in total.