Linguistics

A priori ('from the earlier') and a posteriori ('from the later') are Latin phrases used in philosophy & linguistics to distinguish types of knowledge, justification, or argument by their reliance on experience. A priori knowledge is independent of any experience. Examples include mathematics, tautologies and deduction from pure reason. A posteriori knowledge depends on empirical evidence. Examples include most fields of science and aspects of personal knowledge.

The terms originate from the analytic methods found in Organon, a collection of works by Aristotle. Prior analytics (a priori) is about deductive logic, which comes from definitions and first principles. Posterior analytics (a posteriori) is about inductive logic, which comes from observational evidence.

Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the study of deductively valid inferences or logical truths. It examines how conclusions follow from premises based on the structure of arguments alone, independent of their topic and content. Informal logic is associated with informal fallacies, critical thinking, and argumentation theory. Informal logic examines arguments expressed in natural language whereas formal logic uses formal language. When used as a countable noun, the term "a logic" refers to a specific logical formal system that articulates a proof system. Logic plays a central role in many fields, such as philosophy, mathematics, computer science, and linguistics.

Logic studies arguments, which consist of a set of premises that leads to a conclusion. An example is the argument from the premises "it's Sunday" and "if it's Sunday then I don't have to work" leading to the conclusion "I don't have to work." Premises and conclusions express propositions or claims that can be true or false. An important feature of propositions is their internal structure. For example, complex propositions are made up of simpler propositions linked by logical vocabulary like ${\displaystyle \land }$ (and) or ${\displaystyle \to }$ (if...then). Simple propositions also have parts, like "Sunday" or "work" in the example. The truth of a proposition usually depends on the meanings of all of its parts. However, this is not the case for logically true propositions. They are true only because of their logical structure independent of the specific meanings of the individual parts.

In linguistics, syntax (/ˈsɪntæks/ SIN-taks) is the study of how words and morphemes combine to form larger units such as phrases and sentences. Central concerns of syntax include word order, grammatical relations, hierarchical sentence structure (constituency), agreement, the nature of crosslinguistic variation, and the relationship between form and meaning (semantics). Diverse approaches, such as generative grammar and functional grammar, offer unique perspectives on syntax, reflecting its complexity and centrality to understanding human language.

In philology, a commentary is a line-by-line or even word-by-word explication usually attached to an edition of a text in the same or an accompanying volume. It may draw on methodologies of close reading and literary criticism, but its primary purpose is to elucidate the language of the text and the specific culture that produced it, both of which may be foreign to the reader. Such a commentary usually takes the form of footnotes, endnotes, or separate text cross-referenced by line, paragraph or page.

Means of providing commentary on the language of the text include notes on textual criticism, syntax and semantics, and the analysis of rhetoric, literary tropes, and style. The aim is to remove, lessen or point out linguistic obstacles to reading and understanding the text.

In linguistics, a koine or koiné language or dialect (pronounced /ˈkɔɪ.neɪ/, KOY-nay; from Ancient Greek κοινή 'common') is a standard or common dialect that has arisen as a result of the contact, mixing, and often simplification of two or more mutually intelligible varieties of the same language.

As speakers already understood one another before the advent of the koiné, the process of koineization is not as drastic as pidginization and creolization. Unlike pidginization and creolization, there is often no prestige dialect target involved in koineization.

The concept of Italic peoples is widely used in linguistics and historiography of ancient Italy. In a strict sense, commonly used in linguistics, it refers to the Osco-Umbrians and Latino-Faliscans, speakers of the Italic languages, a subgroup of the Indo-European language family. In a broader sense, commonly used in historiography, all the ancient peoples of Italy are referred to as Italic peoples, including the non-Indo-European ones, as Rhaetians, Ligures and Etruscans. As the Latins achieved a dominant position among these tribes, by virtue of the expansion of the Roman civilization, the other Italic tribes adopted Latin language and culture as part of the process of Romanization.

Egyptian Arabic, locally known as Colloquial Egyptian, or simply as Masri, is the most widely spoken vernacular Arabic variety in Egypt. It is part of the Afro-Asiatic language family, and originated in the Nile Delta in Lower Egypt. The estimated 111 million Egyptians speak a continuum of dialects, among which Cairene is the most prominent. It is also understood across most of the Arabic-speaking countries due to broad Egyptian influence in the region, including through Egyptian cinema and Egyptian music. These factors help make it the most widely spoken and by far the most widely studied variety of Arabic.

While it is primarily a spoken language, the written form is used in novels, plays and poems (vernacular literature), as well as in comics, advertising, some newspapers and transcriptions of popular songs. In most other written media and in radio and television news reporting, literary Arabic is used. Literary Arabic is a standardized language based on the language of the Qur'an, i.e. Classical Arabic. The Egyptian vernacular is almost universally written in the Arabic alphabet for local consumption, although it is commonly transcribed into Latin letters or in the International Phonetic Alphabet in linguistics text and textbooks aimed at teaching non-native learners. Egyptian Arabic's phonetics, grammatical structure, and vocabulary are influenced by the Coptic language; its rich vocabulary is also influenced by Turkish and by European languages such as French, Italian, Greek, and English.

In articulatory phonetics, a consonant is a speech sound that is articulated with complete or partial closure of the vocal tract, except for [h], which is pronounced without any stricture in the vocal tract. Examples are [p] and [b], pronounced with the lips; [t] and [d], pronounced with the front of the tongue; [k] and [g], pronounced with the back of the tongue; [h], pronounced throughout the vocal tract; [f], [v], [s], and [z] pronounced by forcing air through a narrow channel (fricatives); and [m] and [n], which have air flowing through the nose (nasals). Most consonants are pulmonic, using air pressure from the lungs to generate a sound. Very few natural languages are non-pulmonic, making use of ejectives, implosives, and clicks. Contrasting with consonants are vowels.

Since the number of speech sounds in the world's languages is much greater than the number of letters in any one alphabet, linguists have devised systems such as the International Phonetic Alphabet (IPA) to assign a unique and unambiguous symbol to each attested consonant. The English alphabet has fewer consonant letters than the English language has consonant sounds, so digraphs like ⟨ch⟩, ⟨sh⟩, ⟨th⟩, and ⟨ng⟩ are used to extend the alphabet, though some letters and digraphs represent more than one consonant. For example, the sound spelled ⟨th⟩ in "this" is a different consonant from the ⟨th⟩ sound in "thin". (In the IPA, these are [ð] and [θ], respectively.)

In the linguistic study of written languages, a syllabary is a set of written symbols that represent the syllables or (more frequently) morae which make up words.

A symbol in a syllabary, called a syllabogram, typically represents an (optional) consonant sound (simple onset) followed by a vowel sound (nucleus)—that is, a CV (consonant+vowel) or V syllable—but other phonographic mappings, such as CVC, CV- tone, and C (normally nasals at the end of syllables), are also found in syllabaries.