All articles starting with E
17,681 articles
Expansion draft
NHL expansion draft: special draft stocking new franchises' rosters from existing teams' unprotected players. Held since 1967; 2017 Vegas rules change produced the most successful first-year team; Seattle drafted 30 players in 2021.
Expansion joint
An expansion joint, also called a movement joint, is a deliberate gap or flexible bellows that lets bridges, buildings, and pipelines expand and contract without cracking.
Expansion microscopy
Expansion microscopy (ExM) is a sample preparation method that embeds fixed cells and tissues in a swellable polymer gel, enlarging them so nanoscale structures become resolvable on conventional microscopes. It was first published in 2015.
Expansion of Gatwick Airport
The Expansion of Gatwick Airport, known as the Northern Runway Project, is a £2.2 billion plan approved in 2025 to bring Gatwick's northern standby runway into routine use from 2030.
Expansion of Major League Soccer
Expansion of Major League Soccer: the league's controlled franchise sales from 10 teams (1996) to 30 (San Diego FC, 2025), with fees rising from $5M to $500M under its single-entity, closed-league model.
Expansion of orbit
Expansion of orbit (ICD-11 9A24.1, 眼窩開大) is an increase in bony orbital cavity volume, seen pathologically in silent sinus syndrome and trauma causing enophthalmos, and induced surgically by orbital decompression or tissue expanders.
Expansion of the universe
The expansion of the universe is the increase over time of distances between gravitationally unbound galaxies, at the Hubble rate of about 67 to 74 kilometers per second per megaparsec, and accelerating since 1998.
Expansion of the Wari empire
The expansion of the Wari empire (Expansión huari) was the growth of the Wari state from Huari, Peru, across much of highland Peru from about 600 to 1000 CE.
Expansion pack
Expansion pack: substantial add-on content for an existing video game, historically a boxed PC retail product (1990–2005) adding 50–80% of the base game's content; distinct from small DLC and mods, and shaped by the Micro Star v. FormGen copyright ruling.
Expansion ratio (engine)
The expansion ratio of a piston engine is the ratio of cylinder volume at the end of the power stroke to the volume at the start of expansion.
Expansion sequencing
Expansion sequencing (ExSeq) is an imaging method that physically expands preserved tissue in a swellable hydrogel before in situ sequencing, mapping RNA transcripts at nanoscale resolution.
Expansion team
Expansion team: a new franchise admitted to a sports league (also called an expansion club) to grow the league, starting with no roster or history. Key examples: MLB's 1961 Expansion Era, MLS growth to 30 teams, WNBA expansion to 18.
Expansionary fiscal policy
Expansionary fiscal policy is the deliberate use of government spending increases, tax cuts, or larger transfers to raise aggregate demand, with multipliers largest in recessions.
Expansionary monetary policy
Expansionary monetary policy is the set of actions a central bank takes to stimulate economic activity, chiefly by cutting interest rates and, when rates near zero, buying assets.
Expansive learning
Expansive learning is a theory of learning, within cultural-historical activity theory, in which a group constructs new knowledge and practices by resolving contradictions in its own work or study.
Expatriate
Expatriate: a person living outside their country of origin, usually temporarily and often on corporate assignment; also called expat. Distinguished from migrant by privilege, and critiqued in migration scholarship as a postcolonial, racially asymmetric category.
Expatriate little magazines in Paris
Expatriate little magazines in Paris were small, often short-lived literary periodicals published by American and British writers in Paris during the 1920s and 1930s.
Expatriates in the United Arab Emirates
Expatriates in the UAE, about 8.7 million migrant workers over 80 percent of residents, live under the kafala sponsorship system; key issues include heat exposure, wage theft, and labor reforms.
Expats (TV series)
Expats is a 2024 American drama limited series adapted by Lulu Wang from Janice Y.K. Lee's novel The Expatriates, starring Nicole Kidman on Amazon Prime Video.
Expect
Expect is a Tcl extension and standalone interpreter for automating interactive programs such as telnet, ftp, and passwd, conceived by Don Libes at NIST in 1987 and released in 1990 as public domain.
Expect the Unexpected (非常突然)
Expect the Unexpected (非常突然, Fai seung dat yin) is a 1998 Milkyway Image Hong Kong crime film directed by Patrick Yau, produced by Johnnie To and Wai Ka-fai, starring Lau Ching-wan and Simon Yam, famous for its ending in which the whole police unit dies.
Expectancy theory
Expectancy theory, or VIE theory, is Victor Vroom's 1964 work-motivation model in which motivational force equals expectancy times instrumentality times valence, with noted empirical criticisms.
Expectant management
Expectant management, also known as watchful waiting or conservative management, is a clinical approach in which a condition is monitored without immediate treatment to see if it resolves naturally.
Expectation confirmation model
The expectation confirmation model (ECM) is a survey-based theory in information systems research explaining why users continue or stop using a technology after initial adoption.
Expectation propagation
Expectation propagation (EP) is a deterministic approximate Bayesian inference algorithm, introduced by Minka in 2001, that approximates an intractable posterior by iteratively matching moments of local site approximations.
Expectation propagation detection
Expectation propagation detection (EPD) is an iterative approximate Bayesian method for recovering transmitted symbols in MIMO wireless receivers, reaching near maximum-likelihood accuracy at polynomial computational cost.
Expectation value (quantum mechanics)
The expectation value in quantum mechanics is the average measurement outcome of an observable, weighted by each result's probability; a single measurement returns an eigenvalue, not the average.
Expectation–maximization algorithm
The expectation–maximization (EM) algorithm, formalized by Dempster, Laird, and Rubin in 1977, is an iterative method for maximum likelihood estimation in statistical models with unobserved latent variables or incomplete data.
Expectation, moments and probability inequalities
Expectation, moments and probability inequalities is an area of probability theory in which expectation and moments measure random variables and inequalities such as Markov's and Chebyshev's bound their deviations.
Expectations (Olivia Rodrigo song)
Olivia Rodrigo song "expectations" (2026), track 12 on her third album you seem pretty sad for a girl so in love; written with Amy Allen and Dan Nigro; Chappell Roan remix, her first remix, released October 16, 2026; reached No. 20 on the Hot 100.