1. Classification and related languages

Lithuanian fits into the Indo-European family as follows:

Many linguists treat Baltic and Slavic as forming a Balto-Slavic subgroup, based on shared phonological and morphological innovations. Others argue that Baltic and Slavic are separate branches that have strongly influenced each other.

Within Baltic, Lithuanian belongs to the East Baltic branch, alongside Latvian and Latgalian. The West Baltic group (Old Prussian and related languages) became extinct by around the 18th century. Lithuanian retains many archaic Indo-European features, which is why it is frequently cited in comparative Indo-European linguistics.

2. Historical overview and development

Early Baltic stage

Hydronyms and archaeological evidence suggest that early Baltic dialects were once spoken over a wide area around and east of the Baltic Sea. By about the first millennium BCE, Baltic can be divided into Western Baltic and Eastern Baltic linguistic units.

From a historical perspective:

• Proto-Indo-European → Proto-Balto-Slavic

• Proto-Balto-Slavic → Proto-Baltic and Proto-Slavic

• Proto-Baltic → Proto-West Baltic and Proto-East Baltic

• Proto-East Baltic → Lithuanian, Latvian, Latgalian

Emergence of Lithuanian

The differentiation of East Baltic into early Lithuanian and early Latvian is generally placed roughly in the first millennium CE, though precise dating is difficult. By the late Middle Ages, distinctive Lithuanian dialects were established in the area of present-day Lithuania.

Lithuanian was clearly recognised as a distinct language by the early 15th century; it is mentioned among the languages represented at the Council of Constance (1414–1418).

First texts and Old Lithuanian

The earliest surviving major text in Lithuanian is Martynas Mažvydas’ catechism (1547), written in a western dialect. The language of the 16th–17th century texts is known as Old Lithuanian, which shows several features now lost or reduced in modern standard Lithuanian, such as:

• More extensive use of the dual number.

• Additional local cases (inessive, illative, adessive, allative) in parallel with the simple locative.

• Nasal vowels still pronounced as such (written ą, ę, į, ų).

Standardisation and modern Lithuanian

From the 16th to 18th centuries, several regional written norms developed:

In the 19th century, under the influence of national revival and grammarians such as Jonas Jablonskis, a unified standard Lithuanian was codified, based primarily on western Aukštaitian. After the restoration of Lithuanian statehood in 1918, Lithuanian became the sole official language, which greatly strengthened the standard variety.

3. Dialects and sub-branches

Modern Lithuanian has two major dialect groups: Aukštaitian (Highland) and Samogitian (Žemaitian, Lowland), each with several subdialects.

• Aukštaitian forms the basis of the standard language. It is historically associated with the political core of the Grand Duchy of Lithuania.

• Samogitian shows more marked phonological differences (e.g. diphthong developments, stress patterns) and is sometimes regarded as a separate language by local activists, though in traditional classification it is a dialect of Lithuanian.

These dialects developed as the Lithuanian-speaking territory was split historically between Lithuania proper and Lithuania Minor (in East Prussia), and through contact with neighbouring languages such as Old Prussian, Polish, Belarusian and Latvian.

4. Grammatical overview

Lithuanian is a highly inflected language with rich nominal and verbal morphology. It generally has no definite or indefinite articles, and syntactic relations are expressed largely through case endings and verbal inflection.

4.1 Nouns, gender and cases

Lithuanian nouns have:

• Two genders: masculine and feminine.

• Two numbers: singular and plural (the dual survives only in relics and some dialects).

• Seven main cases in modern standard language: nominative, genitive, dative, accusative, instrumental, locative, vocative.

Example paradigm (masculine noun namas “house”):

• Nom. sg.: namas – “(a/the) house”

• Gen. sg.: namo – “of (the) house”

• Dat. sg.: namui – “to/for (the) house”

• Acc. sg.: namą – “(the) house” (object)

• Instr. sg.: namu – “with/by (the) house”

• Loc. sg.: name – “in/at (the) house”

• Voc. sg.: name! – “O house!”

4.2 Definite and indefinite reference

Lithuanian lacks separate articles like English a, an, the. Instead, definiteness is expressed by:

1. Context and word order

   • Automobilis atvažiuoja.
     “The car is coming.”

   • Atvažiuoja automobilis.
     “A car is coming.” (more “new information”)

2. Demonstrative pronouns (see below):

   • tas namas – “that/the house”

3. Definite adjective forms (attested especially in written language):

   • geras namas – “a good house”

   • gerasis namas – “the good house (the one already known)”

4.3 Pronouns

Lithuanian has a rich pronominal system, including personal, demonstrative, reflexive, interrogative, relative, indefinite and negative pronouns.

Demonstrative pronouns

Common demonstratives include:

• šis, ši – “this (near speaker)”

• tas, ta – “that (general)”

• anas, ana – “that (over there, more distant)”

Example:

• Šis namas yra naujas. – “This house is new.”

• Tas žmogus mane pažįsta. – “That man knows me.”

Relative pronouns

The primary relative pronoun is kuris, kuri, kurie (“who, which, that”).

• Tai žmogus, kuris gyvena Vilniuje.
  “This is the person who lives in Vilnius.”

Interrogative (question) words

Some common interrogatives:

• kas? – “who? / what?”

• ką? – “what? (object)”

• kur? – “where?”

• kada? – “when?”

• kodėl? – “why?”

• kaip? – “how?”

Examples:

• Kas tu esi? – “Who are you?”

• Kur tu gyveni? – “Where do you live?”

• Kodėl tu vėluoji? – “Why are you late?”

4.4 Word order

The neutral word order is often SVO (subject–verb–object), but because of rich inflection the order is relatively free and used to mark information structure (focus vs. topic).

Compare:

• Aš skaitau knygą. – “I am reading a book.” (neutral)

• Knygą skaitau aš. – “It is I who is reading the book.” (emphasis on I)

• Knygą aš skaitau. – “It is the book that I am reading.” (emphasis on book)

4.5 Verbs: conjugation and tenses

Lithuanian verbs inflect for:

• Person: 1st, 2nd, 3rd

• Number: singular, plural

• Tense: present, simple past, past iterative (habitual), future

• Mood: indicative, imperative, conditional/subjunctive, plus an indirect mood in some descriptions

• Aspect-like contrasts expressed partly via derivation and context rather than a strict Slavic-style aspect system.

There are typically three conjugation classes. The main auxiliary verb is būti “to be”, used to form compound tenses and passive constructions.

Example: regular verb dirbti – “to work”

Present tense

• aš dirbu – I work / am working

• tu dirbi – you work

• jis / ji dirba – he / she works

• mes dirbame – we work

• jūs dirbate – you (pl.) work

• jie / jos dirba – they work

Sentence:

• Aš dirbu biure. – “I work in an office.”

Simple past

• aš dirbau – I worked

• Tu vakar daug dirbai. – “You worked a lot yesterday.”

Past iterative (habitual past)

• aš dirbdavau – I used to work / would work (regularly)

• Aš jaunystėje dirbdavau fabrike.
  “In my youth I used to work in a factory.”

Future

• aš dirbsiu – I will work

• Rytoj dirbsiu namuose. – “Tomorrow I will work at home.”

The verb būti – “to be”

Present:

• aš esu – I am

• tu esi – you are

• jis / ji yra – he / she is

Example sentence:

• Aš esu studentas. – “I am a student.”

4.6 Participles

Lithuanian has an exceptionally rich system of participles, with active and passive forms in several tenses, and extensive use in subordinate clauses. For example:

• skaitantis studentas – “the student (who is) reading” (present active participle)

• skaityta knyga – “the read book / the book that has been read” (past passive participle)

Participles are central to many complex constructions and contribute to the language’s synthetic character.

5. Lithuanian and other Baltic languages

Lithuanian is closest to Latvian, with which it shares many core features, yet the two are not mutually intelligible. Both also show similarities to the extinct Old Prussian, though that language is more divergent and preserves different archaic traits.

5.1 Lexical and grammatical comparison

The table below summarises some key similarities and differences among Lithuanian, Latvian and Old Prussian (where data are commonly cited):

Despite clear cognates (e.g. saulė/saule “sun”, vilkas/vilks “wolf”), centuries of separate development, different contact influences (Germanic and Finnic for Latvian; Slavic and Germanic for Lithuanian; Germanic for Old Prussian) and distinct sound changes have produced notable differences in phonology, morphology and vocabulary.

6. Conclusion

Lithuanian is a central language for understanding the history of Indo-European due to its archaic structure and conservative phonology. As an East Baltic language, it is closely related to Latvian but distinct enough to be non-mutually intelligible. Its historical development reflects a complex interplay of internal evolution and external influences, while its dialect system shows how geography and history have shaped regional speech. Grammatically, Lithuanian is richly inflected, lacks articles, has a complex system of pronouns and participles, and a relatively free word order driven by information structure.

Alongside its Baltic relatives—living (Latvian) and extinct (Old Prussian and others)—Lithuanian forms an important branch of the Indo-European family and remains a key reference point for historical and comparative linguistics.

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