Language

There are six official languages used in United Nations (UN) meetings and in which the UN writes and publishes all its official documents. In 1946, five languages were chosen as official languages of the UN: English, French, Russian, Spanish, and Chinese. In 1973, Arabic was voted to be an additional official language. As of 2025, the official languages of the United Nations are:

• English (British English with Oxford spelling), in Latin alphabet;
• French (Metropolitan French – français métropolitain / langues d'oïl) in Latin alphabet;
• Spanish (Peninsular Spanish – español peninsular / castellano) in Spanish alphabet;
• Russian (Moscow Russian – московское произношение moskovskoye proiznosheniye) in the Russian Cyrillic alphabet;
• Chinese (Standard Mandarin – 中文 zhōngwén / 普通话 pǔtōnghuà) in Simplified Chinese characters;
• Arabic (Modern Standard Arabic – العربية al-ʿarabiyyah / الفصحى al-fuṣḥá) in Naskh / Arabic abjad.

According to the UN Charter each of these six languages is equally authoritative although English and French have traditionally received preferential status and are the only two official and working languages of the UN Secretariat. It is an unspoken rule that the UN Secretary General and other high ranking United Nations officials must be fluent (at least C1 – Advanced fluency level according to the Common European Framework of Reference for Languages / CEFRL) in at least English and French. The UN has struggled to provide parity of all 6 languages as the English language has become the dominant world language in the digital age.

This is a list of languages by total number of speakers.

It is difficult to define what constitutes a language as opposed to a dialect. For example, while Arabic is sometimes considered a single language centred on Modern Standard Arabic, other authors consider its mutually unintelligible varieties separate languages. Similarly, Chinese is sometimes viewed as a single language because of a shared culture and common literary language, but sometimes considered multiple languages. Conversely, colloquial registers of Hindi and Urdu are almost completely mutually intelligible and are sometimes classified as one language, Hindustani. Rankings of languages should therefore be used with caution, as it is not possible to devise a coherent set of linguistic criteria for distinguishing languages in a dialect continuum.

An official language is defined by the Cambridge English Dictionary as, "the language or one of the languages that is accepted by a country's government, is taught in schools, used in the courts of law, etc." Depending on the decree, establishment of an official language might also place restrictions on the use of other languages. Designated rights of an official language can be created in written form or by historic usage.

An official language is recognized by 178 countries, of which 101 recognize more than one. The government of Italy made Italian their official language in 1999, and some nations (such as Mexico and Australia) have never declared de jure official languages at the national level. Other nations have declared non-indigenous official languages.

Humans, scientifically known as Homo sapiens, are primates that belong to the biological family of great apes and are characterized by hairlessness, bipedality, and high intelligence. Humans have large brains compared to body size, enabling more advanced cognitive skills that facilitate successful adaptation to varied environments, development of sophisticated tools, and formation of complex social structures and civilizations.

Humans are highly social, with individual humans tending to belong to a multi-layered network of distinct social groups – from families and peer groups to corporations and political states. As such, social interactions between humans have established a wide variety of values, social norms, languages, and traditions (collectively termed institutions), each of which bolsters human society. Humans are also highly curious: the desire to understand and influence phenomena has motivated humanity's development of science, technology, philosophy, mythology, religion, and other frameworks of knowledge; humans also study themselves through such domains as anthropology, social science, history, psychology, and medicine. As of 2025, there are estimated to be more than 8 billion living humans.

A classical language is any language with an independent literary tradition and a large body of ancient written literature.

Classical languages are usually extinct languages. Those that are still in use today tend to show highly diglossic characteristics in areas where they are used, as the difference between spoken and written language has widened over time.

A lexicon (pl. lexicons, rarely lexica) is the vocabulary of a language or branch of knowledge (such as nautical or medical). In linguistics, a lexicon is a language's inventory of lexemes. The word lexicon derives from Greek word λεξικόν (lexikon), neuter of λεξικός (lexikos) meaning 'of or for words'.

Linguistic theories generally regard human languages as consisting of two parts: a lexicon, essentially a catalogue of a language's words (its wordstock); and a grammar, a system of rules which allow for the combination of those words into meaningful sentences. The lexicon is also thought to include bound morphemes, which cannot stand alone as words (such as most affixes). In some analyses, compound words and certain classes of idiomatic expressions, collocations and other phrasemes are also considered to be part of the lexicon. Dictionaries are lists of the lexicon, in alphabetical order, of a given language; usually, however, bound morphemes are not included.

A root (also known as a root word or radical) is the core of a word that is irreducible into more meaningful elements. In morphology, a root is a morphologically simple unit which can be left bare or to which a prefix or a suffix can attach. The root word is the primary lexical unit of a word, and of a word family (this root is then called the base word), which carries aspects of semantic content and cannot be reduced into smaller constituents.Content words in nearly all languages contain, and may consist only of, root morphemes. However, sometimes the term "root" is also used to describe the word without its inflectional endings, but with its lexical endings in place. For example, chatters has the inflectional root or lemma chatter, but the lexical root chat. Inflectional roots are often called stems. A root, or a root morpheme, in the stricter sense, is a mono-morphemic stem. An etymon is the root word in a proto-language from which the descendant forms arose.

The traditional definition allows roots to be either free morphemes or bound morphemes. Root morphemes are the building blocks for affixation and compounds. However, in polysynthetic languages with very high levels of inflectional morphology, the term "root" is generally synonymous with "free morpheme". Many languages have a very restricted number of morphemes that can stand alone as a word: Yup'ik, for instance, has no more than two thousand.

In linguistics, language death occurs when a language loses its last native speaker. By extension, language extinction is when the language is no longer known, including by second-language speakers, when it becomes known as an extinct language. A related term is linguicide, the death of a language from natural or political causes.

The disappearance of a minor language as a result of the absorption or replacement by a major language is sometimes called "glottophagy".

The distinction between literal and figurative language exists in all natural languages; the phenomenon is studied within certain areas of language analysis, in particular stylistics, rhetoric, and semantics.

• Literal language is the usage of words exactly according to their direct, straightforward, or conventionally accepted meanings: their denotation.
• Figurative (or non-literal) language is the usage of words in addition to, or deviating beyond, their conventionally accepted definitions in order to convey a more complex meaning or achieve a heightened effect. This is done by language-users presenting words in such a way that their audience equates, compares, or associates the words with normally unrelated meanings. A common intended effect of figurative language is to elicit audience responses that are especially emotional (like excitement, shock, laughter, etc.), aesthetic, or intellectual.

The ancient Greek philosopher Aristotle, and later the Roman rhetorician Quintilian, were among the early documented language analysts who expounded on the differences between literal and figurative language. A comprehensive scholarly examination of metaphor in antiquity, and the way its use was fostered by Homer's epic poems The Iliad and The Odyssey, is provided by William Bedell Stanford.

An ethnolinguistic group (or ethno-linguistic group) is a group that is unified by both a common ethnicity and language. Most ethnic groups share a first language. However, "ethnolinguistic" is often used to emphasise that language is a major basis for the ethnic group, especially in regard to its neighbours.

A central concept in the linguistic study of ethnolinguistic groups is ethnolinguistic vitality, the ability of the group's language and ethnicity to sustain themselves. An ethnolinguistic group that lacks such vitality is unlikely to survive as a distinct entity. Factors that influence the ethnolinguistic vitality are demographics, institutional control and status (including language planning factors).