A method of language learning based on mutual language practicing by learning partners who speak different languages.

constructed language

A dead language.

A language that is spoken by someone but is not their mother tongue.

Synonym of mother tongue

(computing) A language of an abstract machine designed as an aid in the analysis of computer programs.

(software) In a manner that is independent of the computer language being used.

(linguistics) A dominant and prestigious language which gradually causes extinction of other, especially minor languages.

(sociology, linguistics) An unofficial language spoken by a minority of people.

Any of the official languages of the European Union.