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A first language (also native language, mother tongue, arterial language, or L1) is the language or are the languages a person has learned from birth〔Bloomfield, Leonard. (Language ) ISBN 81-208-1196-8〕 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 one's ethnic group rather than one's first language.〔( "K *The Native Speaker: Myth and Reality By Alan Davies ) ISBN 1-85359-622-1 〕 Children brought up speaking more than one language can have more than one native language, and be bilingual. By contrast, a ''second language'' is any language that one speaks other than one's first language. ==Terminology== One of the more widely accepted definitions of a native speaker is someone who was born in a particular country and was raised to speak the language of that country during the critical period of their development,〔(cite http://www.ipedr.com/vol26/16-ICLLL%202011-L00033.pdf).〕 The journal or qualifies as a "native speaker" of a language if they were born and immersed in the language during youth, in a family where the adults shared a similar language experience as the child.〔Love, Nigel, and Umberto Ansaldo. "The Native Speaker and the Mother Tongue." Language Sciences 32.6 (2010): 589-93. Print.〕 Native speakers are considered to be an authority on their given language due to their natural acquisition process regarding the language, versus having learned the language later in life. This is achieved through personal interaction with the language and speakers of the language. Native speakers will not necessarily be knowledgeable about every grammatical rule of the language, but will have good "intuition" of the rules through their experience with the language.〔 Sometimes the term ''mother tongue'' or ''mother language'' is used for the language that a person learned as a child at home (usually from their parents). Children growing up in bilingual homes can, according to this definition, have more than one mother tongue or native language. In the context of population censuses conducted on the Canadian population, Statistics Canada defines ''mother tongue'' as "the first language learned at home in childhood and still understood by the individual at the time of the census."〔(【引用サイトリンク】title=mother tongue ) 〕 It is quite possible that the first language learned is no longer a speaker's dominant language. This includes young immigrant children, whose families have moved to a new linguistic environment, as well as people who learned their mother tongue as a young child at home (rather than the language of the majority of the community), who may have lost, in part or in totality, the language they first acquired (see language attrition). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「first language」の詳細全文を読む スポンサード リンク
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