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- DictionaryFirst lan·guage/fərst ˈlaNGɡwij/
noun
- 1. a person's native language: "she speaks Tiwa as her first language"
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noun
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A first language (L1), native language, native tongue, or mother tongue is the first language a person has been exposed to from birth or within the critical period. In some countries, the term native language or mother tongue refers to the language of one's ethnic group rather than the individual's actual first language. Generally, to state a language as a mother tongue, one must have full native ... Wikipedia