What does the word acquisition really mean?

The definition of an acquisition is the act of getting or receiving something, or the item that was received. First language acquisition is a process whereby children unconsciously acquire their mother tongue in the case of monolingual speakers or their mother tongues, in the event of bi and multi-lingual speakers respectively. The process takes place during the first six or seven years of children’s lives until the lateralization of their brains occurs as a possible result of hormonal changes.