A first language (also mother language, mother tongue, native language, arterial language, or L1) often means the language that a person learns first.
It helps one understand words and concepts in the style of that language.
Sometimes, but not often, first language means the language that a person speaks best (the second language is then spoken less well than the first language, etc.). In that sense, a person could have more than one first or second language.
The first languages of the national majority usually are to be recognized as national languages of the nation.
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