A first language (also native language, mother tongue, arterial language, or L1) is the language(s) a person has learned from birth 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. Sometimes, there can be more than one mother tongue, (for example, when the child's parents speak different languages). Those children are usually called bilingual.
By contrast, a second language is any language that one speaks other than one's first language.
Read more about First Language: Terminology, Significance, On Multilinguality
Famous quotes containing the word language:
“We find that the child who does not yet have language at his command, the child under two and a half, will be able to cooperate with our education if we go easy on the “blocking” techniques, the outright prohibitions, the “no’s” and go heavy on “substitution” techniques, that is, the redirection or certain impulses and the offering of substitute satisfactions.”
—Selma H. Fraiberg (20th century)