All articles starting with D

Deficit round robin

Deficit round robin (DRR) is a network scheduling algorithm, invented by M. Shreedhar and George Varghese in 1995, that fairly queues variable-length packets in constant time.

Deficit spending

Deficit spending, also known as budget deficit or deficit financing, is a government's deliberate policy of spending more than it collects in revenue, usually covered by borrowing.

Definable set

A definable set is a subset of a structure's universe picked out exactly by a first-order formula, and is a basic object of study in model theory.

Define Ventures is a San Francisco-based early-stage venture capital firm investing exclusively in digital-health companies, founded and led by managing partner Lynne Chou O'Keefe, with about $800 million in assets under management.

Oct 20, 2026

DEFINE-FLOW trial

DEFINE-FLOW (NCT02328820), a prospective nonrandomized multicenter trial of 455 patients in Europe and Japan, tested combined FFR and CFR measurement for coronary stenoses; intact CFR did not make low-FFR lesions safe to defer revascularization.

Defined benefit pension plan

A defined benefit pension plan, also known as a final salary pension, is an employer-sponsored retirement plan that promises a fixed benefit set by a formula, with the employer bearing investment risk.

Defining Issues Test

The Defining Issues Test (DIT) is a psychometric test of moral judgment development, introduced by James Rest in 1974 as a paper-and-pencil alternative to Kohlberg's interview.

Definite matrix

A definite matrix is a Hermitian (in the real case, symmetric) matrix whose quadratic form takes values of only one sign, classified as positive, negative, semidefinite, or indefinite.

Definitely Maybe

Definitely Maybe is Oasis's 1994 debut album on Creation Records, produced by the band with Mark Coyle. It topped the UK chart as Britain's fastest-selling debut at the time, after abandoned Monnow Valley sessions and a Sawmills re-recording.

Definitely, Maybe

Definitely, Maybe is a 2008 romantic comedy directed by Adam Brooks, starring Ryan Reynolds as a divorced father recounting his past romances to his daughter.

Definition

A definition is a statement that fixes the meaning, extension, or essence of a term, concept, or thing; varieties include real, nominal, and operational definitions used in science.

Definition of done

The definition of done, or DoD, is a Scrum practice: a shared checklist of quality requirements, such as testing and code review, that work must satisfy to count as finished.

Definition of music

Definition of music: the problem of distinguishing music from other organized sound. Key formulations include organized sound, Blacking's humanly organized sound, Merriam's concept-behavior-sound model, and tonality or aesthetic conditions, with Cage's 4'33" as the classic test case.

Definition of planet

The definition of planet, also called the IAU definition of planet, is the 2006 International Astronomical Union resolution requiring a body to orbit the Sun, be nearly round, and clear its orbital neighborhood.

Definitions of economics

Definitions of economics are statements of what the field studies, from the classical economists' study of national wealth to Alfred Marshall's and Lionel Robbins's influential formulations.

Definitions of fascism

Definitions of fascism: no single scholarly definition exists. Griffin's palingenetic ultranationalism, Paxton's behavioral definition, Payne's typology, Eco's fourteen features, Stanley's ten pillars, and the restrictive versus generic schools.

Definitions of whiteness in the United States

Definitions of whiteness in the United States: federal (OMB SPD 15, Census), legal (1790 Naturalization Act, Ozawa, Thind), and social criteria for who counts as White, including the 2024 MENA removal and boundary expansion to European ethnics.

Definitive chemoradiotherapy

Definitive chemoradiotherapy (dCRT) treats localized cancer with concurrent full-dose radiation and chemotherapy, without surgery, aiming at cure; it is best established for locally advanced esophageal cancer.

Definitive fixation

Definitive fixation is the permanent implant-based stabilization of a fracture, recommended as primary treatment in stable patients, while unstable polytrauma patients first receive temporary external fixation.

Definitive radiotherapy

Definitive radiotherapy is radiation treatment given with curative intent as the primary or sole therapy for a tumor, without surgery, typically delivered in small daily doses over several weeks.

Deflagration

Deflagration is the propagation of a combustion zone through a reactive material at subsonic speed, driven by heat transfer rather than a shock wave, as in gunpowder and gas flames.

Deflagration-to-detonation transition

The deflagration-to-detonation transition (DDT) is the process by which a subsonic combustion wave, a deflagration, accelerates and reorganizes into a supersonic detonation, seen in pulse detonation engines and vapor cloud explosions.

Deflategate

Deflategate: 2015 NFL scandal in which Patriots quarterback Tom Brady was suspended four games over allegedly deflated footballs in the AFC Championship Game; Wells Report, arbitration, and federal appeals followed until July 2016.

Deflation

Deflation is a sustained decline in the general price level of an economy, the mirror image of inflation. It is rarer, occurring about 18 percent of the time historically.

Deflationary theory of truth

The deflationary theory of truth, also called the redundancy theory, holds that truth has no deep nature and that "it is true that p" says no more than p.

Deflazacort

Deflazacort (Emflaza) is a corticosteroid prodrug, FDA-approved in 2017 for Duchenne muscular dystrophy in patients 2 years and older, dosed 0.9 mg/kg/day, metabolized via CYP3A4 to 21-desacetyldeflazacort.

Deflection (engineering)

In structural and mechanical engineering, deflection is the displacement of a structural element such as a beam or column under load, calculated with Euler-Bernoulli beam theory and capped by building codes as a fraction of span.

Deflection of light by the Sun

The deflection of light by the Sun is the bending of starlight by the Sun's gravity, predicted at 1.75 arcseconds at the solar limb and first measured in 1919.