High Quality Content by WIKIPEDIA articles! A first language (also native language, mother tongue, arterial language, or L1) is the language(s) a person has learned from birth or within the critical period, or that a person speaks the best and so is often the basis for sociolinguistic identity. In some countries, the terms native language or mother tongue refer to the language of ones ethnic group rather than ones first language. Sometimes, there can be more than one mother tongue, when the childs parents speak different languages. Those children are usually called bilingual.
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