Native speaker - Glossary of Translation
A person's first language, native language or mother tongue is the language that was learned first by the person. Correspondingly, the person is called a native speaker of the language, although one may also be a native speaker of more than one language if all of the languages are learned naturally without formal instruction, such as through cultural immersion before puberty. Often a child learns the basics of his or her first languages from his or her family. (Wikipedia 2006)
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