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Levee breach
A levee breach, also called a dike breach, is the failure of a flood-control embankment that lets river or sea water flood the protected area behind it.
Level 3 Communications
Level 3 Communications was an American fiber-optic network company headquartered in Broomfield, Colorado, formed from the Kiewit conglomerate in 1998 and acquired by CenturyLink in 2017.
Level crossing
A level crossing, also known as a railroad or grade crossing, is a place where a railway crosses a road or path without a bridge or tunnel.
Level Crossing Removal Project
The Level Crossing Removal Project (LXRP) is a Victorian Government infrastructure program that removes level crossings in Melbourne, established in 2015 and expanded from 50 to 110 crossings.
Level of service (traffic)
Level of service is a traffic engineering measure describing operating conditions within a traffic stream, graded from A, best, to F, worst, introduced by the 1965 Highway Capacity Manual.
Level shifter
A level shifter, also called a voltage translator, is a circuit that converts digital or analog signals between voltage domains so chips and devices at different supply voltages can communicate.
Levelized cost of electricity
The levelized cost of electricity (LCOE) is the average lifetime cost per unit of electricity generated, combining capital, fuel, financing, and operating costs into a single break-even price.
Levelized cost of water
The levelized cost of water (LCOW) is an economic metric expressing the lifetime cost of a water production system per unit volume, usually dollars per cubic meter.
Levelling (surveying)
Levelling is a surveying method that measures height differences between points using a level establishing a horizontal line of sight and a graduated staff read against it.
LevelTen Energy
LevelTen Energy is a Seattle-based company, founded by Bryce Smith in 2016, that operates a marketplace connecting corporate buyers with wind, solar, and storage projects through power purchase agreements.
Levenshtein distance
Levenshtein distance, also called edit distance, is a string metric counting the minimum single-symbol insertions, deletions, or substitutions needed to transform one string into another.
Levente Vitos
Levente Vitos is a computational materials physicist, professor at KTH Royal Institute of Technology in Stockholm, who created the EMTO-CPA method making first-principles simulation of random alloys, steels, and high-entropy alloys practical.
Lever
A lever is a simple machine consisting of a rigid bar that pivots on a fulcrum to multiply force, with examples including crowbars, seesaws, and wheelbarrows.
Lever action
The lever action is a repeating firearm action in which a lever around the trigger guard cycles the breech, ejecting the spent round and chambering a fresh one.
Lever House
Lever House is a 1952 office skyscraper at 390 Park Avenue in Midtown Manhattan, designed by Gordon Bunshaft of Skidmore, Owings & Merrill as Lever Brothers' American headquarters.
Leveraged buyout of Electronic Arts
The leveraged buyout of Electronic Arts was the $55 billion take-private acquisition of the video game publisher by Saudi Arabia's PIF, Silver Lake, and Affinity Partners, completed in 2026.
Levi Theodore Thompson
Levi Theodore Thompson is an American chemical engineer elected to the National Academy of Engineering in 2021 and dean of the University of South Florida College of Engineering.
Leviathan (yacht)
Leviathan is a 111-meter (364 ft) diesel-electric superyacht built by the Dutch shipyard Oceanco, delivered in November 2025 to Valve co-founder Gabe Newell, reportedly costing around $500 million.
Leviathan Gas Field
Leviathan is an offshore natural gas field in the Mediterranean Sea, discovered in 2010. It is the largest gas reservoir in Israel and began production in 2019.
Levidian LOOP
Levidian LOOP is a modular methane-splitting system by Cambridge company Levidian Nanosystems that uses microwave plasma to crack methane into graphene and hydrogen without carbon dioxide.
Leviton
Leviton is a privately held American manufacturer of electrical wiring devices, lighting, data networking, and energy management products, founded in New York in 1906 by Evser and Isidor Leviton.
LeVo
LeVo is Tencent AI Lab's song-generation model family, which generates full-length songs with vocals and accompaniment from lyrics and descriptive prompts; its open-source SongGeneration series was first released in June 2025.
Lewes derailment
The Lewes derailment was a 2026 railway accident near Lewes, East Sussex, in which the rear three carriages of a Southern passenger train overturned, injuring 30.
Lewes Priory
Lewes Priory, the Priory of St Pancras, was a Cluniac monastery in Lewes, Sussex, founded by William de Warenne and Gundrada between 1078 and 1082.
Lewis acid-base adduct engineering in perovskites
Lewis acid-base adduct engineering in perovskites is a materials-design strategy for perovskite solar cells in which Lewis bases or acids form coordination adducts that passivate defects and control crystallization.
Lewis B. Stillwell
Lewis B. Stillwell (1863–1941) was an American electrical engineer who designed the Niagara Falls AC generating plant and directed the electrification of New York's elevated railways and first subway.
Lewis base passivation of perovskite solar cells
Lewis base passivation of perovskite solar cells is a defect-control strategy in which electron-pair-donating molecules with nitrogen, oxygen, or sulfur donors coordinate undercoordinated Pb2+ defects, reducing recombination and improving efficiency and stability.
Lewis Berkley Davis Jr.
Lewis Berkley Davis Jr. is an American mechanical engineer whose combustion innovations led to low-nitrogen-oxides gas turbines for electric power generation; he holds over 100 patents.
Lewis gun
The Lewis gun was a light machine gun designed by Isaac Newton Lewis in 1911, the British Army's most widely used machine gun of the First World War.
Lewis Howard Latimer
Lewis Howard Latimer (1848–1928) was an American inventor and patent draftsman, the son of escaped slaves, known for his 1882 carbon filament process and Bell's telephone patent drawings.