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air traffic control

(Encyclopedia)air traffic control, the system by which airplanes are safely routed into and out of major airports. Air traffic control in the United States is centered in a number of regional control centers that r...

bias, in electricity

(Encyclopedia)bias, a voltage, current, or other input applied to a device or system as a reference or to set its conditions of operation. A bias is usually steady but may vary with time, usually within a fixed and...

Siren, in Greek mythology

(Encyclopedia)Siren sīˈrən [key], in Greek mythology, one of three sea nymphs, usually represented with the head of a woman and the body of a bird. Daughters of Phorcus or of Achelous, the Sirens inhabited an is...

Caruso, Enrico

(Encyclopedia)Caruso, Enrico kəro͞oˈsō, Ital. änrēˈkō käro͞oˈzō [key], 1873–1921, Italian operatic tenor, b. Naples. The natural beauty, range, and power of his voice made him one of the greatest sing...

saint, in Christianity

(Encyclopedia)saint [O.Fr., from Latin sanctus=holy], in Christianity, a person who is recognized as worthy of veneration. Accounts of saints' lives have been favorite reading material for many, and at times thei...

Fischer-Dieskau, Dietrich

(Encyclopedia)Fischer-Dieskau, Dietrich dēˈtrĭkh fĭshˈər-dēsˈkou [key], 1925–2012, German baritone. Possessed of a sensitive voice capable of a wide variety of range and expression, Fischer-Dieskau was th...

Woffington, Peg

(Encyclopedia)Woffington, Peg (Margaret Woffington), 1714?–1760, English actress, b. Dublin. Her charm and beauty as a child attracted attention, and at the age of 10 she acted in the role of Polly Peachum in a L...

Fitzgerald, Ella

(Encyclopedia)Fitzgerald, Ella, 1917–96, American jazz singer, b. Newport News, Va. Probably the most celebrated jazz vocalist of her generation, Fitzgerald was reared in Yonkers, N.Y., moving after her mother's ...

sonata

(Encyclopedia)sonata sənäˈtə [key], in music, type of instrumental composition that arose in Italy in the 17th cent. At first the term merely distinguished an instrumental piece from a piece with voice, which w...

banjo

(Encyclopedia)banjo, stringed musical instrument, with a body resembling a tambourine. The banjo consists of a hoop over which a skin membrane is stretched; it has a long, often fretted neck and four to nine string...