Zonal auxiliary languages, or zonal constructed languages, are constructed languages made to facilitate communication between speakers of a certain group of closely related languages. They form a subgroup of the international auxiliary languages but are intended to serve a limited linguistic or geographic area, rather than the whole world like Esperanto and Volapük. Although most zonal auxiliary languages are based on European language families, they should not be confused with "Euroclones", a pejorative term for languages intended for global use but based primarily on European material. Since universal acceptance is not the goal for zonal auxiliary languages, the traditional claims of neutrality and universalism, typical for IALs, do not apply. Although they may share the same internationalist commitments of the latter, zonal auxiliary languages have also been proposed as a defense against the effects of the growing hegemony of English on other cultures or as a means to promote a sense of ethnicity or community in a manner similar to revitalized languages, such as Modern Hebrew and Cornish. Related concepts are koiné language, a dialect that naturally emerges as a means of communication among speakers of divergent dialects of a language, and Dachsprache, a dialect that serves as a standard language for other, sometimes mutually unintelligible, dialects. The difference is that a zonal language is typically a mixture of several natural languages and is aimed to serve as an auxiliary for the speakers of different but related languages of the same family.
Most zonal constructed languages were developed during the period of romantic nationalism at the end of the 19th century, but some were created later. Most older zonal constructed languages are now known only to specialists. A modern example is Interslavic, which has become the most successful example of all zonal constructed languages.
