Czech–Slovak languages in the context of "Sorbian languages"

Czech (/tʃɛk/ CHEK; endonym: čeština [ˈtʃɛʃcɪna] ), historically known as Bohemian (/boʊˈhiːmiən, bə-/ boh-HEE-mee-ən, bə-; Latin: lingua Bohemica), is a West Slavic language of the Czech–Slovak group, written in Latin script. Spoken by over 12 million people including second language speakers, it serves as the official language of the Czech Republic. Czech is closely related to Slovak, to the point of high mutual intelligibility, as well as to Polish to a lesser degree. Czech is a fusional language with a rich system of morphology and relatively flexible word order. Its vocabulary has been extensively influenced by Latin and German.

The Czech–Slovak group developed within West Slavic in the high medieval period, and the standardization of Czech and Slovak within the Czech–Slovak dialect continuum emerged in the early modern period. In the later 18th to mid-19th century, the modern written standard became codified in the context of the Czech National Revival. The most widely spoken non-standard variety, known as Common Czech, is based on the vernacular of Prague, but is now spoken as an interdialect throughout most of Bohemia. The Moravian dialects spoken in Moravia and Czech Silesia are considerably more varied than the dialects of Bohemia.

The Lechitic (or Lekhitic) languages are a language subgroup consisting of Polish and several other languages and dialects that were once spoken in the area that is now Poland and eastern Germany. It is one of the branches of the larger West Slavic subgroup; the other branches of this subgroup are the Czech–Slovak languages and the Sorbian languages.

Upper Sorbian (endonym: hornjoserbšćina), occasionally referred to as Wendish (German: Wendisch), is a minority language spoken by Sorbs in the historical province of Upper Lusatia, today part of Saxony, Germany. It is a West Slavic language, along with Lower Sorbian, Czech, Polish, Silesian, Slovak, and Kashubian. It is now spoken by fewer than 10,000 people, mostly in Budyšin and its immediate countryside.

Upper Sorbian differs from its closest relative, Lower Sorbian (with which it forms the Sorbian subgroup), at all levels of the language system: in phonetics, morphology, and vocabulary. At the same time, the two languages share a number of features that distinguish them from other West Slavic languages—in particular, the preservation of the dual number, the retention of simple past tense forms of verbs, and an especially large number of lexical borrowings from German. Several linguistic features link Upper Sorbian with the Lechitic languages, while in a number of other features it is similar to the Czech-Slovak subgroup.

Lechites (Polish: Lechici, German: Lechiten), also known as the Lechitic tribes (Polish: Plemiona lechickie, German: Lechitische Stämme), is a name given to certain West Slavic tribes who inhabited modern-day Poland and eastern Germany, and were speakers of the Lechitic languages. Distinct from the Czech–Slovak subgroup, they are the closest ancestors of ethnic Poles and of Pomeranians, Lusatians and Polabians.