Question

According to linguistics what is a first language definition

Answer 1

According to me it should be write answer ..

Someone's first language is the language that they learned first and speak best; used especially when someone speaks more than one language.

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Answer 2

According to linguistics our first language is our mother tounge.

First language, your native language, or your mother tongue.
First languages are generally maintained for life, with little overt effort on the part of the speaker.
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