All articles starting with S

Second lieutenant

Second lieutenant (2LT) is the most junior commissioned officer grade in the US Army, Air Force, Marine Corps, and Space Force, pay grade O-1, NATO OF-1, equivalent to navy ensign, typically leading a platoon of 16 to 44 soldiers.

Second Life

Second Life: 3D online virtual world launched June 2003 by Linden Lab, founded 1999 by Philip Rosedale. User-built world with Linden Dollar economy; $3.2 billion spent in first decade; still operating with mobile beta.

Second line (parades)

Second line parades are New Orleans street processions led by a brass band and social aid and pleasure club members, with dancing followers behind; rooted in 19th-century benevolent societies, with a September-to-June season.

Oct 3, 2026

Second Love

Second Love (セカンド・ラブ) is a 2015 TV Asahi Japanese romance drama, 7 episodes, Fridays 23:15, starring Kazuya Kamenashi as dancer Taira Kei and Kyoko Fukada as teacher Nishihara Yui; script by Shizuka Oishi, average rating 7.1%. Distinct from Nakamori Akina's 1982 song.

Second Maroon War

The Second Maroon War was an armed conflict in Jamaica from 1795 to 1796 between the British colonial government and the Trelawny Town Maroons, who were defeated and deported.

Oct 15, 2026

Second mate

The second mate, also called the second officer, is a merchant ship's navigating officer, third in the deck department, responsible for charts, navigational equipment, and passage planning.

Second messenger system

Second messenger system: intracellular signaling via cAMP, cGMP, calcium, IP3, and DAG relaying hormone or neurotransmitter signals from cell-surface receptors; founded on Sutherland's cAMP work (1971 Nobel Prize).

Second Mexican Empire

Second Mexican Empire (Segundo Imperio Mexicano), 1864-1867: Habsburg monarchy under Maximilian I installed by Napoleon III's French intervention, collapsed with the Querétaro defeat and Maximilian's 1867 execution.

Second militia of Minin and Pozharsky

The Second militia of Minin and Pozharsky (Второе народное ополчение) was a volunteer army raised in Nizhny Novgorod in 1611 that expelled the Polish garrison from Moscow.

Second Mithridatic War

Second Mithridatic War (83–81 BC), also dated 83–82, a short Roman-Pontic conflict provoked by governor Lucius Licinius Murena's raids into Pontus; Mithridates VI defeated him before Sulla ordered withdrawal.

Second Modi ministry

Second Modi ministry: Narendra Modi's Union Council of Ministers, India, 30 May 2019 to June 2024, after the BJP's 303-seat 2019 win; Shah at Home, Sitharaman Finance, Jaishankar External Affairs; Article 370 abrogation, CAA 2019, Atmanirbhar package.

Oct 15, 2026

Second moment method

The second moment method is a technique in probability and combinatorics that shows a nonnegative random variable is positive or near its mean by controlling its variance, using Chebyshev's inequality.

Second moment of area

The second moment of area, also called the area moment of inertia, is a geometric property of a cross-section that measures its resistance to bending.

Second Mongol invasion of Hungary

Second Mongol invasion of Hungary (1285), the largest Mongol campaign against the kingdom after 1241–1242, part of later thirteenth-century raids; Hungary had since rebuilt with stone castles under Béla IV.

Second mortgage

Second mortgage (junior lien): a loan secured by a home that already secures another loan; includes home equity loans and HELOCs, paid second in foreclosure, priced higher, used for piggyback purchases, home improvement, and debt consolidation.

Second Moscow Trial

The Second Moscow Trial (Второй московский процесс) was a January 1937 show trial in Moscow in which seventeen defendants, led by Yuri Pyatakov and Karl Radek, were convicted of treason.

Second Nagorno-Karabakh War

The Second Nagorno-Karabakh War (Six-Week War, 44-day war) was the September 27 to November 10, 2020 war in which Azerbaijan, using Turkish and Israeli drones, defeated Armenia and Artsakh and regained territory under a Russia-brokered ceasefire.

Second National Front of Escambray

The Second National Front of Escambray (Spanish: Segundo Frente Nacional del Escambray) was a Cuban guerrilla force founded by Eloy Gutiérrez Menoyo in the Escambray Mountains in late 1957.

Second normal form

Second normal form (2NF) is a stage in database normalization, defined by E. F. Codd in 1971, where every non-key column depends on the entire primary key.

Second Occupation of Cuba

The Second Occupation of Cuba (1906–1909) was the second period of United States military government on the island, begun after President Tomás Estrada Palma resigned during an armed revolt.

Second Opium War

Second Opium War (第二次鸦片战争), also Arrow War or Second Anglo-Chinese War: the 1856–1860 war in which Britain and France forced Qing China to legalize opium, open treaty ports, and cede Kowloon via the Treaties of Tianjin and the Convention of Peking.

Second Optional Protocol to the International Covenant on Civil and Political Rights

The Second Optional Protocol to the ICCPR (ICCPR-OP2), adopted by UN General Assembly resolution 44/128 on 15 December 1989, commits states parties to abolish the death penalty, with a single wartime reservation allowed; 92 parties as of 2026.

Second Pacific Squadron

The Second Pacific Squadron (Вторая Тихоокеанская эскадра) was a Russian Imperial Navy force sent in 1904 to relieve Port Arthur, destroyed at Tsushima in 1905.

Sep 23, 2026

Second Partisan Prohibition

The Second Partisan Prohibition (第二次党锢之祸) was the Eastern Han court's purge of scholar-officials by the eunuch faction, beginning in 169 and ending in 184, when the Yellow Turban rebellion brought an amnesty.

Second Partition of Poland

The Second Partition of Poland (Polish: II rozbiór Polski) was the 1793 division of Commonwealth territory between Russia and Prussia, stripping it of about 300,000 km² and over 3 million people.

Second Party System

Second Party System: era of US two-party competition between Jacksonian Democrats and the Whig Party, roughly 1828 to the mid-1850s, built by Martin Van Buren and Henry Clay's American System, ending when the Kansas-Nebraska Act destroyed the Whigs.

Second Peace of Thorn

The Second Peace of Thorn (Drugi pokój toruński) was the treaty signed in Thorn on 19 October 1466, ending the Thirteen Years' War between Poland and the Teutonic Order.

Oct 20, 2026

Second Peak

Second Peak is a 6,545-foot (1,995 m) mountain summit in Grant County, Oregon, near Bear Flat; also the name of summits in Virginia and New Zealand and an athlete-transition organization.

Second People's Militia

The Second People's Militia (Второе ополчение) was a volunteer army raised at Nizhny Novgorod in 1611, led by Kuzma Minin and Prince Dmitry Pozharsky against the Polish interventionists.