A person qualifies as a "native speaker" of a language by being born and immersed in the language during youth, in a family in which the adults shared a similar language experience to the child. Native speakers are considered to be an authority on their given language because of their natural acquisition process regarding the language, as opposed to having learned the language later in life. That is achieved by 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 they will have good "intuition" of the rules through their experience with the language. In the context of population censuses conducted on the Canadian population,
Statistics Canada defines the
mother tongue as "the first language learned at home in childhood and still understood by the individual at the time of the census." It is quite possible that the first language learned is no longer a speaker's dominant language. That 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). According to
Ivan Illich, the term "mother tongue" was first used by
Catholic monks to designate a particular language they used, instead of
Latin, when they were "speaking from the pulpit". That is, the "holy mother the Church" introduced this term and colonies inherited it from Christianity as a part of colonialism.
J. R. R. Tolkien, in his 1955 lecture "
English and Welsh", distinguishes the "native tongue" from the "cradle tongue". The latter is the language one learns during early childhood, and one's true "native tongue" may be different, possibly determined by an inherited linguistic taste and may later in life be discovered by a strong emotional affinity to a specific dialect (Tolkien personally confessed to such an affinity to the
Middle English of the
West Midlands in particular). Children brought up speaking more than one language can have more than one native language, and be
bilingual or
multilingual. By contrast, a
second language is any language that one speaks other than one's first language. == Bilingualism ==