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Gibson, John, American frontiersman

(Encyclopedia)Gibson, John, 1740–1822, American frontiersman, b. Lancaster, Pa. After taking part in the capture (1758) of Fort Duquesne (renamed Fort Pitt) in the French and Indian War, he became a trader with t...

electronegativity

(Encyclopedia)electronegativity ĭlĕkˌtrōnĕgətĭvˈətē [key], in chemistry, tendency for an atom to attract a pair of electrons that it shares with another atom (see chemical bond). For example, the molecule...

Dugdale, Richard Louis

(Encyclopedia)Dugdale, Richard Louis dŭgˈdāl [key], 1841–83, American social investigator, b. Paris. While inspecting (1874) county jails for the New York Prison Association, he developed data for his famous s...

Ronaldo, Cristiano

(Encyclopedia)Ronaldo, Cristiano (Cristiano Ronaldo dos Santos Aveiro), 1985–, Portuguese soccer player. A forward, he began professional play in 2001 with Sporting Portugal. With Manchester United from 2003, he ...

Saroyan, William

(Encyclopedia)Saroyan, William səroiˈən [key], 1908–81, American author, b. Fresno, Calif. Of Armenian background and extremely prolific, he created works that combine optimism, sentimentality, and a rhapsodic...

Rallis

(Encyclopedia)Rallis, Greek political family. Dimitrios Rallis, 1844–1921, a three-time premier, he was first in the office in May–Oct., 1897. Although he managed to arrange an armistice between Greece and Turk...

Boucher, François

(Encyclopedia)Boucher, François fräNswäˈ bo͞oshāˈ [key], 1703–70, French painter. Boucher's art embodied the spirit of his time; it was elegant, frivolous, and artificial. He studied briefly with François...

Bond, Julian

(Encyclopedia)Bond, Julian (Horace Julian Bond), 1940–2015, U.S. civil-rights leader, b. Nashville, Tenn. As a student at Morehouse College, he participated in sit-ins at segregated Atlanta restaurants. He was a ...

acceleration

(Encyclopedia)acceleration, change in the velocity of a body with respect to time. Since velocity is a vector quantity, involving both magnitude and direction, acceleration is also a vector. In order to produce an ...

conducting

(Encyclopedia)conducting, in music, the art of unifying the efforts of a number of musicians simultaneously engaged in musical performance. In the Middle Ages and Renaissance the conductor was primarily a time beat...