- See also changes related to Multilingualism, or pages that link to Multilingualism or to this page or whose text .
- Linguistics : The scientific study of language.
- Sociolinguistics : Branch of linguistics concerned with language in social contexts - how people use language, how it varies, how it contributes to users' sense of identity, etc.
- Language acquisition : The study of how language comes to users of first and second languages.
- Lingua franca : Any language used for widespread communication between groups who do not share a native language or where native speakers are typically in the minority; name from 'Lingua Franca', a pidgin once used around the Mediterranean.
- Contact language : any language which is created through contact between two or more existing languages; may occur when people who share no native language need to communicate, or when a language of one group becomes used for wider communication.
- Language attrition : The loss of a first or second language or a portion of that language by individuals.
- Diglossia : Linguistic situation in which two (often very closely related) languages are used within one speech community, for different purposes.