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communication
communication transfer of information, such as thoughts and messages, as contrasted with transportation, the transfer of goods and persons (see information theory ). The basic forms of communication are by signs (sight) and by sounds (hearing; see language ). The reduction of communication to wri...
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Oakland
Oakland city (1990 pop. 372,242), seat of Alameda co., W Calif., on the eastern side of San Francisco Bay; inc. 1852. Together with San Francisco and San Jose, the city comprises the fourth largest metropolitan area in the United States. A containerized shipping port and a major rail terminus, Oakl...
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broker
broker one who acts as an intermediary in a sale or other business transaction between two parties. Such a person conducts individual transactions only, is given no general authority by the employers, discloses the names of the principals in the transaction to each other, and leaves to them the con...
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Tigre
Tigre , city (1991 pop. 256,005), Buenos Aires prov., E Argentina. A railroad terminus and river port with good road connections, Tigre is a market for the fruit grown in the surrounding area. The city has sawmills and shipyards, as well as a naval museum.
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credit card
credit card device used to obtain consumer credit at the time of purchasing an article or service. Credit cards may be issued by a business, such as a department store or an oil company, to make it easier for consumers to buy their products. Alternatively credit cards may be issued by third parties...
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Chicago
Chicago , city (1990 pop. 2,783,726), seat of Cook co., NE Ill., on Lake Michigan; inc. 1837. The third largest city in the United States and the heart of a metropolitan area of over 8 million people, it is the commercial, financial, industrial, and cultural center for a vast region and a midcontine...
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Jean Arp
Jean Arp 1887-1966, French sculptor and painter. Arp was connected with the Blaue Reiter in Munich, various avant-garde groups in Paris, including the surrealists, and the Dadaists in Zürich. He consistently created novel and abstract forms in various media—bas-reliefs, collages, paint...
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Charles Hard Townes
Charles Hard Townes 1915-, American physicist and educator, b. Greenville, S.C. He was educated at Furman Univ., Duke, and the California Institute of Technology (Ph.D., 1939), was on the technical staff of the Bell Telephone Laboratories (1939-48), and taught at Columbia (1948-59). After serving a...
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Terre Haute
Terre Haute , city (1990 pop. 51,483), seat of Vigo co., W Ind., on the Wabash River; inc. 1816. The commercial and trade center of a farm and coal-mining region, its diverse manufactures include foods and beverages, paper and aluminum products, farm and communications equipment, chemicals, pharmace...
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operational amplifier
operational amplifier amplifier whose output voltage is proportional to the negative of its input voltage and that boosts the amplitude of an input signal many times, i.e., has a very high gain. It is usually connected so that part of the output is fed back to the input. Operational amplifiers we...
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