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decibel

(Encyclopedia)decibel dĕsˈəbĕlˌ, –bəl [key], abbr. dB, unit used to measure the loudness of sound. It is one tenth of a bel (named for A. G. Bell), but the larger unit is rarely used. The decibel is a measu...

Cleomenes I

(Encyclopedia)Cleomenes I klēŏmˈĭnēz [key], d. c.489 b.c., king of Sparta after 518 b.c. In accordance with Sparta's policy of helping oligarchies in other states at the expense of the tyrants or the people, C...

Dimitrovgrad

(Encyclopedia)Dimitrovgrad dĭmēˈtrôvgrät [key], city, S Bulgaria, on the Maritsa River. Located on the ...

McCulloch v. Maryland

(Encyclopedia)McCulloch v. Maryland, case decided in 1819 by the U.S. Supreme Court, dealing specifically with the constitutionality of a Congress-chartered corporation, and more generally with the dispersion of po...

horsepower

(Encyclopedia)horsepower, unit of power in the English system of units. It is equal to 33,000 foot-pounds per minute or 550 foot-pounds per second or approximately 746 watts. The term horsepower originated with Jam...

servomechanism

(Encyclopedia)servomechanism, automatic device for the control of a large power output by means of a small power input or for maintaining correct operating conditions in a mechanism. It is a type of feedback contro...

North Platte project

(Encyclopedia)North Platte project, unit of the U.S. Bureau of Reclamation, in the North Platte River valley, W Nebr. and E Wyo. It supplies hydroelectric power to many towns and industries and provides irrigation ...

apostolic succession

(Encyclopedia)apostolic succession, in Christian theology, the doctrine asserting that the chosen successors of the apostles enjoyed through God's grace the same authority, power, and responsibility as was conferre...

Elizabeth II, queen of Great Britain and Northern Ireland

(Encyclopedia)Elizabeth II, 1926–2022, former queen of Great Britain and Northern Ireland (1952–2022), elder daughter and successor of George VI, and Britain's lo...

Fianna Fáil

(Encyclopedia)Fianna Fáil fēˈənə fäl [key], Irish political party, organized in 1926 by opponents of the Anglo-Irish treaty of 1921 establishing the Irish Free State and setting up Northern Ireland as part of...