All articles A–Z

Standard-Model Extension

The Standard-Model Extension is an effective field theory combining the Standard Model with General Relativity plus all possible Lorentz-violating operators, introduced by Colladay and Kostelecký in 1998.

StandardAero

StandardAero is an independent provider of aerospace engine maintenance, repair, and overhaul services, headquartered in Scottsdale, Arizona, and tracing its origins to a 1911 Winnipeg machine shop.

Standardbred

Standardbred, American harness racing horse breed, trotters and pacers pulling a sulky; named for the 1879 2:30-mile registration standard, founded on Messenger and Hambletonian 10 (foaled 1849).

Standardization

Standardization is the consensus process by which experts, industry, and government develop voluntary standards specifying requirements for products, processes, and services, which become binding when adopted into contracts or regulation.

Standardization of Cart Axles (Che Tong Gui)

Standardization of Cart Axles (车同轨), recorded in the Shiji, was a Qin dynasty unification measure generally read as requiring uniform cart dimensions, though scholars dispute what it required.

Standardization of script, weights, measures, currency, and axle widths

Standardization of script, weights, measures, currency, and axle widths (書同文、車同軌) refers to measures ordered by Qin Shihuang in 221 BC to unify writing, laws, measures, coinage, and cart axle widths.

Standardization of the script

Standardization of the script (書同文) was the Qin dynasty policy of unifying Chinese writing, recorded in the Shiji, with small seal as the official standard.

Standardization of weights and measures

Standardization of weights and measures (统一度量衡) was the Qin dynasty's empire-wide unification of length, capacity, and weight standards, ordered by the First Emperor in 221 BC.

Sep 29, 2026

Standardized patient simulation

Standardized patient simulation is a medical education method in which trained people portray patients realistically and repeatably so learners can practice and be assessed on clinical skills.

Standardized Precipitation Evapotranspiration Index

The Standardized Precipitation Evapotranspiration Index (SPEI) is a multiscalar drought index, proposed in 2010, that measures drought from the climatic water balance of precipitation minus potential evapotranspiration over chosen time scales.

Standardized Precipitation Index

The Standardized Precipitation Index (SPI) is a drought index expressing precipitation over periods like 3 or 12 months as a standardized departure from local climatological norms.

Sep 29, 2026

Standardized rate

A standardized rate is a disease or mortality rate adjusted to a reference age structure, allowing fair comparison of populations; it includes directly standardized rates and SMRs.

Standardized test

A standardized test, also called a standardized examination, is an assessment given and scored under consistent conditions so scores can be compared across test takers.

Standards Australia

Standards Australia, formerly the Standards Association of Australia, is Australia's independent, not-for-profit national standards body. Founded in 1922, it maintains over 6,000 Australian Standards and represents Australia at ISO and the IEC.

Standards Council of Canada

The Standards Council of Canada, or Conseil canadien des normes, is a federal Crown corporation created in 1970 that coordinates voluntary standardization and accredits standards development and conformity assessment bodies.

Standards for Educational and Psychological Testing

The Standards for Educational and Psychological Testing, issued jointly by AERA, APA, and NCME, sets professional expectations for validity, reliability, and fairness in testing; the current edition dates from 2014.

Standards organization

A standards organization, or standards development organization, is a body that develops voluntary technical standards promoting quality, safety, and interoperability, ranging from ISO, IEC, and ITU to private consortia.

Standards Organization of Nigeria

The Standards Organization of Nigeria (SON) is Nigeria's apex standardization body, established by an act of 1971 to prepare Nigerian Industrial Standards, certify products, and assure quality of goods.

Oct 3, 2026

Standby

Stand-by (Standby) is a 2000 French drama by Roch Stéphanik starring Dominique Blanc as a woman abandoned at Orly airport who stays and turns to prostitution; it won the 2001 César for Best Actress and the Prix Cyril Collard.

Standby power

Standby power, also called vampire power or phantom load, is the electricity consumed by devices that appear switched off while still plugged in, totaling 20 to 60 watts per home.

Ständchen, D 889 (Schubert)

Ständchen, D 889 ('Horch, horch! die Lerch'), a 1826 Schubert song for voice and piano on Schlegel's Shakespeare translation, C major, distinct from the Schwanengesang serenade.

Standedge Tunnels

The Standedge Tunnels are four parallel tunnels beneath the Pennines between Marsden and Diggle, England, including the canal tunnel on the Huddersfield Narrow Canal, opened in 1811 and the longest in Britain.

Oct 21, 2026

Standen

Standen is an Arts and Crafts country house at East Grinstead, West Sussex, built 1891–1894 by Philip Webb for James and Margaret Beale, furnished by Morris & Co., Grade I listed, and a National Trust property since 1972.

Standin' on the Corner Park

Standin' on the Corner Park, Winslow, Arizona: a Route 66 park opened in 1999 commemorating the Eagles' song "Take It Easy," featuring a John Pugh mural, a Ron Adamson bronze statue, and a flatbed Ford.

Standing (law)

Standing (law), or locus standi, is the capacity to bring a lawsuit; in U.S. federal court it requires injury in fact, causation, and redressability under Lujan, while state courts often apply looser standing doctrines.

Standing accretion shock instability

The standing accretion shock instability (SASI) is a hydrodynamic instability in which a stalled core-collapse supernova shock sloshes and spirals, first seen in 2D simulations in 2003.