Dictionary Definition

delta

Noun

1 a low triangular area where a river divides before entering a larger body of water
2 the 4th letter of the Greek alphabet

Extensive Definition

Delta most commonly refers to:
• Delta (letter), the letter Δ or δ in the Greek alphabet, also used as a mathematical symbol
• River delta, a landform at the mouth of a river
Delta also has the following meanings:

Science and technology

Astronomy and physics

• Delta baryon, a subatomic particle with spin 3/2
• In Bayer designation, one of the stars in a constellation (e.g., Delta Cygni)
• Delta-v, a term used in astrodynamics for the total 'effort' to change from one space trajectory to another

Mathematics and computer science

• DELTA (VMS), a debugger used in the VMS operating system
• Δ often denotes a difference; δ can represent a small change or amount
• In elementary set theory and Boolean algebras, Δ usually denotes the symmetric difference
• An inverted delta (\nabla), known as del or nabla, is used as a vector differential operator
• Kronecker delta, a function of two variables which is 1 when they are equal
• Dirac delta function, a distribution used as an approximation for a spike function
• Delta encoding, a technique in computer communications and version-control
• In formal fuzzy logic, Δ denotes a unary connective representing the full truth of a proposition (often called Baaz Delta connective)
• Δ indicates a change of state between two before and after state schemas in the Z notation

Mathematical finance

• One of the Greeks used in option and derivatives pricing representing the rate of change of the option price with respect to changes in the underlying price

Medicine

• Single use of Delta (Δ) is an abbreviation for the Diagnosis of a patient
• Double use of Delta (ΔΔ) is an abbreviation for the Differential diagnosis of a patient

Miscellanea

• Delta waves, a low level EEG reading associated with sleep
• Delta Works, a flood-protection works in the Netherlands
• A form of tricycle having two wheels in back and one wheel in front
• The refractory section in the roof of an electric arc furnace (EAF) through which one or more electrodes enter
• Delta, a quadra group used in socionics
delta in Bosnian: Delta (čvor)
delta in Bulgarian: Делта (пояснение)
delta in Czech: Delta
delta in Welsh: Delta
delta in Danish: Delta
delta in German: Delta (Begriffsklärung)
delta in Spanish: Delta
delta in Esperanto: Delto
delta in Basque: Delta
delta in French: Delta (homonymie)
delta in Galician: Delta
delta in Korean: 델타
delta in Croatian: Delta (razdvojba)
delta in Italian: Delta
delta in Hebrew: דלתא (פירושונים)
delta in Kurdish: Delta
delta in Latvian: Delta
delta in Lithuanian: Delta (reikšmės)
delta in Dutch: Delta
delta in Japanese: デルタ
delta in Norwegian: Delta
delta in Polish: Delta (ujednoznacznienie)
delta in Portuguese: Delta (desambiguação)
delta in Russian: Дельта
delta in Slovak: Delta
delta in Finnish: Delta (täsmennyssivu)
delta in Swedish: Delta (olika betydelser)
delta in Ukrainian: Дельта
delta in Volapük: Delta

Synonyms, Antonyms and Related Words

V, alkali flat, alluvial plain, basin, bill, bottomland, branch, breakwater, bushveld, campo, cape, champaign, champaign country, chersonese, coastal plain, coral reef, crotch, crutch, desert, down, downs, fan, fell, flat, flat country, flatland, flats, foreland, fork, furcula, furculum, grass veld, grassland, groin, head, headland, heath, hook, inguen, lande, level, llano, lowland, lowlands, lunar mare, mare, mesa, mesilla, moor, moorland, mull, naze, ness, offshoot, open country, pampa, pampas, peneplain, peninsula, plain, plains, plateau, playa, point, prairie, promontory, prong, ramification, reef, salt flat, salt marsh, salt pan, sandspit, savanna, sebkha, spit, spur, stem, steppe, table, tableland, tongue, tree veld, trident, tundra, upland, vega, veld, weald, wide-open spaces, wishbone, wold