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Urban League, National

(Encyclopedia)Urban League, National, voluntary nonpartisan community service agency, founded in 1910, whose goal is to help end racial segregation and discrimination in the United States, especially toward African...

heat of combustion

(Encyclopedia)heat of combustion, heat released during combustion. In particular, it is the amount of heat released when a given amount (usually 1 mole) of a combustible pure substance is burned to form incombustib...

inequality

(Encyclopedia)inequality, in mathematics, statement that a mathematical expression is less than or greater than some other expression; an inequality is not as specific as an equation, but it does contain informatio...

European Council

(Encyclopedia)European Council, institution of the European Union (EU) responsible for defining the EU's general political direction and priorities. It is composed of an elected president (who serves a two-and-a-ha...

crystal

(Encyclopedia)CE5 Types of crystal crystal, a solid body bounded by natural plane faces that are the external expression of a regular internal arrangement of constituent atoms, molecules, or ions. The formation...

specific gravity

(Encyclopedia)specific gravity, ratio of the weight of a given volume of a substance to the weight of an equal volume of some reference substance, or, equivalently, the ratio of the masses of equal volumes of the t...

9/11

(Encyclopedia)9/11, the terrorist attacks on Sept. 11, 2001, in the United States, and the associated events and impact of those attacks. The attacks, which were carried out by agents of Al Qaeda (a militant Islami...

Vásquez, Horacio

(Encyclopedia)Vásquez, Horacio ōräˈsyō väˈskās [key], 1860–1936, president of the Dominican Republic (1899–1903, 1903–7, 1924–30). A dominating figure in the nation, even when out of office, Vásque...

Fourteenth Amendment

(Encyclopedia)Fourteenth Amendment, addition to the U.S. Constitution, adopted 1868. The amendment comprises five sections. Section 2 provides for apportionment of membership in the House of Representatives on th...

Foot Resolution

(Encyclopedia)Foot Resolution, offered in 1829 by Samuel Augustus Foot in the U.S. Senate. This resolution instructed the committee on public lands to inquire into the limiting of public land sale. The Jacksonian D...