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Alpha (uppercase , lowercase ) is the first letter of the
Greek alphabet The Greek alphabet has been used to write the Greek language since the late 9th or early 8th century BC. It was derived from the earlier Phoenician alphabet, and is the earliest known alphabetic script to systematically write vowels as wel ...
. In the system of Greek numerals, it has a value of one. Alpha is derived from the Phoenician letter ''
aleph Aleph (or alef or alif, transliterated ʾ) is the first Letter (alphabet), letter of the Semitic abjads, including Phoenician alphabet, Phoenician ''ʾālep'' 𐤀, Hebrew alphabet, Hebrew ''ʾālef'' , Aramaic alphabet, Aramaic ''ʾālap'' � ...
'' , whose name comes from the West Semitic word for ' ox'. Letters that arose from alpha include the
Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
letter and the
Cyrillic The Cyrillic script ( ) is a writing system used for various languages across Eurasia. It is the designated national script in various Slavic, Turkic, Mongolic, Uralic, Caucasian and Iranic-speaking countries in Southeastern Europe, Ea ...
letter .


Uses


Greek

In
Ancient Greek Ancient Greek (, ; ) includes the forms of the Greek language used in ancient Greece and the classical antiquity, ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Greek ...
, alpha was pronounced and could be either phonemically long ( ː or short ( . Where there is ambiguity, long and short alpha are sometimes written with a macron and
breve A breve ( , less often , grammatical gender, neuter form of the Latin "short, brief") is the diacritic mark , shaped like the bottom half of a circle. As used in Ancient Greek, it is also called , . It resembles the caron (, the wedge or in ...
today: . * = ' "a time" * = ' "tongue" In Modern Greek,
vowel length In linguistics, vowel length is the perceived or actual length (phonetics), duration of a vowel sound when pronounced. Vowels perceived as shorter are often called short vowels and those perceived as longer called long vowels. On one hand, many ...
has been lost, and all instances of alpha simply represent the open front unrounded vowel . In the polytonic orthography of Greek, alpha, like other vowel letters, can occur with several diacritic marks: any of three accent symbols (), and either of two breathing marks (), as well as combinations of these. It can also combine with the iota subscript ().


Greek grammar

In the AtticIonic dialect of Ancient Greek, long alpha fronted to ( eta). In Ionic, the shift took place in all positions. In Attic, the shift did not take place after epsilon, iota, and rho (; ). In Doric and Aeolic, long alpha is preserved in all positions. *Doric, Aeolic, Attic ' – Ionic ', "country" *Doric, Aeolic ' – Attic, Ionic ', "report" Privative a is the Ancient Greek prefix or , added to words to negate them. It originates from the Proto-Indo-European ( syllabic nasal) and is cognate with English ''un-''. Copulative a is the Greek prefix or . It comes from Proto-Indo-European .


Mathematics and science

The letter alpha represents various concepts in
physics Physics is the scientific study of matter, its Elementary particle, fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge whi ...
and
chemistry Chemistry is the scientific study of the properties and behavior of matter. It is a physical science within the natural sciences that studies the chemical elements that make up matter and chemical compound, compounds made of atoms, molecules a ...
, including alpha radiation, angular acceleration, alpha particles, alpha carbon and strength of electromagnetic interaction (as fine-structure constant). Alpha also stands for thermal expansion coefficient of a compound in physical chemistry. In ethology, it is used to name the dominant individual in a group of animals. In aerodynamics, the letter is used as a symbol for the angle of attack of an aircraft and the word "alpha" is used as a synonym for this property. In astronomy, α is often used to designate the brightest star in a constellation. In
mathematics Mathematics is a field of study that discovers and organizes methods, Mathematical theory, theories and theorems that are developed and Mathematical proof, proved for the needs of empirical sciences and mathematics itself. There are many ar ...
, the letter alpha is used to denote the area underneath a normal curve in
statistics Statistics (from German language, German: ', "description of a State (polity), state, a country") is the discipline that concerns the collection, organization, analysis, interpretation, and presentation of data. In applying statistics to a s ...
to denote significance level when proving
null Null may refer to: Science, technology, and mathematics Astronomy *Nuller, an optical tool using interferometry to block certain sources of light Computing *Null (SQL) (or NULL), a special marker and keyword in SQL indicating that a data value do ...
and alternative hypotheses. It is also commonly used in algebraic solutions representing quantities such as angles. In
mathematical logic Mathematical logic is the study of Logic#Formal logic, formal logic within mathematics. Major subareas include model theory, proof theory, set theory, and recursion theory (also known as computability theory). Research in mathematical logic com ...
, α is sometimes used as a placeholder for
ordinal number In set theory, an ordinal number, or ordinal, is a generalization of ordinal numerals (first, second, th, etc.) aimed to extend enumeration to infinite sets. A finite set can be enumerated by successively labeling each element with the leas ...
s. It is used for Stoneham numbers. Most occurrences of alpha in science are the lowercase alpha. The uppercase letter alpha is not generally used as a symbol because it tends to be rendered identically to the uppercase Latin A. The proportionality operator " " (in
Unicode Unicode or ''The Unicode Standard'' or TUS is a character encoding standard maintained by the Unicode Consortium designed to support the use of text in all of the world's writing systems that can be digitized. Version 16.0 defines 154,998 Char ...
: U+221D) is sometimes mistaken for alpha.


International Phonetic Alphabet

In the
International Phonetic Alphabet The International Phonetic Alphabet (IPA) is an alphabetic system of phonetic notation based primarily on the Latin script. It was devised by the International Phonetic Association in the late 19th century as a standard written representation ...
, the letter ɑ, which looks similar to the lower-case alpha, represents the open back unrounded vowel.


History and symbolism


Origin

The
Phoenician alphabet The Phoenician alphabet is an abjad (consonantal alphabet) used across the Mediterranean civilization of Phoenicia for most of the 1st millennium BC. It was one of the first alphabets, attested in Canaanite and Aramaic inscriptions fo ...
was adopted for Greek in the early 8th century BC, perhaps in Euboea. The majority of the letters of the Phoenician alphabet were adopted into Greek with much the same sounds as they had had in Phoenician, but '' ʼāleph'', the Phoenician letter representing the
glottal stop The glottal stop or glottal plosive is a type of consonantal sound used in many Speech communication, spoken languages, produced by obstructing airflow in the vocal tract or, more precisely, the glottis. The symbol in the International Phonetic ...
, was adopted as representing the vowel ; similarly, '' '' and '' ʽayin'' are Phoenician consonants that became Greek vowels, epsilon and omicron , respectively.


Plutarch

Plutarch, in '' Moralia'', presents a discussion on why the letter alpha stands first in the alphabet. Ammonius asks Plutarch what he, being a Boeotian, has to say for Cadmus, the Phoenician who reputedly settled in Thebes and introduced the alphabet to Greece, placing ''alpha'' first because it is the Phoenician name for ox—which, unlike Hesiod, the Phoenicians considered not the second or third, but the first of all necessities. "Nothing at all," Plutarch replied. He then added that he would rather be assisted by Lamprias, his own grandfather, than by
Dionysus In ancient Greek religion and Greek mythology, myth, Dionysus (; ) is the god of wine-making, orchards and fruit, vegetation, fertility, festivity, insanity, ritual madness, religious ecstasy, and theatre. He was also known as Bacchus ( or ; ...
' grandfather, i.e. Cadmus. For Lamprias had said that the first articulate sound made is "alpha", because it is very plain and simple—the air coming off the mouth does not require any motion of the tongue—and therefore this is the first sound that children make. According to Plutarch's natural order of attribution of the
vowel A vowel is a speech sound pronounced without any stricture in the vocal tract, forming the nucleus of a syllable. Vowels are one of the two principal classes of speech sounds, the other being the consonant. Vowels vary in quality, in loudness a ...
s to the
planet A planet is a large, Hydrostatic equilibrium, rounded Astronomical object, astronomical body that is generally required to be in orbit around a star, stellar remnant, or brown dwarf, and is not one itself. The Solar System has eight planets b ...
s, alpha was connected with the
Moon The Moon is Earth's only natural satellite. It Orbit of the Moon, orbits around Earth at Lunar distance, an average distance of (; about 30 times Earth diameter, Earth's diameter). The Moon rotation, rotates, with a rotation period (lunar ...
.


Alpha and Omega

As the first letter of the alphabet, Alpha as a Greek numeral came to represent the number 1. Therefore, Alpha, both as a symbol and term, is used to refer to the "first", or "primary", or "principal" (most significant) occurrence or status of a thing. The New Testament has God declaring himself to be the "Alpha and Omega, the beginning and the end, the first and the last." ( Revelation 22:13, KJV, and see also 1:8). Consequently, the term "alpha" has also come to be used to denote "primary" position in social hierarchy, examples being the concept of dominant "alpha" members in groups of animals.


Unicode

All code points with or but without (for accented Greek characters, see Greek diacritics: Computer encoding): * * * * * * * * * * * * * * * * * * * * * * * * * * * *


Notes


References

{{reflist Greek letters Vowel letters