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Pamir

(Encyclopedia)Pamir pəmērˈ, pä– [key] or Pamirs, mountainous region of central Asia, located mainly in Tajikistan and extending into NE Afghanistan and SW Xinjiang Uygur Autonomous Region, China; called the �...

number theory

(Encyclopedia)number theory, branch of mathematics concerned with the properties of the integers (the numbers 0, 1, −1, 2, −2, 3, −3, …). An important area in number theory is the analysis of prime number...

syndicalism

(Encyclopedia)syndicalism sĭnˈdĭkəlĭzəm [key], political and economic doctrine that advocates control of the means and processes of production by organized bodies of workers. Like anarchists, syndicalists bel...

Washington Monument

(Encyclopedia)Washington Monument, obelisk-shaped tower, 555 ft 51⁄9 in. (169.3 m) high, located on a 106-acre (43-hectare) site at the west end of the Mall, Washington, D.C.; dedicated 1885. The world's tallest ...

actinium

(Encyclopedia)actinium ăktĭnˈēəm [key] [Gr.,=like a ray], radioactive chemical element; symbol Ac; at. no. 89; mass number of most stable isotope 227; m.p. about 1,050℃; b.p. 3,200℃±300℃; sp. gr. 10.07;...

Brazzaville

(Encyclopedia)Brazzaville brăzˈəvĭl, Fr. bräzävēlˈ [key], city (1984 pop. 585,812), capital of the Republic of the Congo, on Pool Malebo of the Congo River. It is the nation's largest city and its administr...

air navigation

(Encyclopedia)air navigation, science and technology of determining the position of an aircraft with respect to the surface of the earth and accurately maintaining a desired course (see navigation). Basic to air ...

Debussy, Claude Achille

(Encyclopedia)Debussy, Claude Achille klôd äshēlˈ dəbüsēˈ [key], 1862–1918, French composer, exponent of musical impressionism. He studied for 11 years at the Paris Conservatory, receiving its Grand Prix ...

Poitiers

(Encyclopedia)Poitiers pwätyāˈ [key], city (1990 pop. 82,507), capital of Vienne dept., W central France, on the Clain River. The ancient capital of Poitou, it is now an industrial, agricultural, and communicati...

Boston Symphony Orchestra

(Encyclopedia)Boston Symphony Orchestra, founded in 1881 by Henry Lee Higginson, who was its director and financial backer until 1918. The orchestra performed at the Old Boston Music Hall for nearly 20 years until ...