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Possible definitions for tbc

ABC
Major U.S. television network. It began when the expanding national radio network NBC split into the separate Red and Blue networks in 1928. To avoid a communications monopoly, NBC was forced to sell the Blue network in 1941. Its buyer, Edward J. Noble, maker of Life-Savers candies, gave the company its present name. After merging with United Paramount Theaters in 1953, ABC expanded into the emerging television industry and soon became one of the three top networks. It specialized in sports broadcasting and developed the instant replay in 1961. It was bought by Capital Cities Communications in 1985 and by the Walt Disney Co. in 1995.


BBC
Publicly financed broadcasting system in Britain. A private company at its founding in 1922, it was replaced by a public corporation under royal charter in 1927. The BBC World Service began in 1932, and by the 1990s was broadcasting programs in 38 languages to 120 million people worldwide. BBC television service, which kept its monopoly on television service until a commercial channel began broadcasting in 1954, introduced regular color broadcasts in Europe in 1967. The BBC radio monopoly ended in 1972. The BBC today offers five radio networks and two national television channels.


NBC
Major U.S. commercial broadcasting company. It was formed in 1926 by RCA Corp., GE, and Westinghouse and was the first U.S. company to operate a broadcast network. Directed by RCA's president D. Sarnoff, it became wholly owned by RCA in 1930. NBC was initially divided into the semi-independent Blue Network, based on station WJZ, and the Red Network, based on WEAF, each with links to stations in other cities. By 1938 the Red Network carried 75% of NBC's programs. The Blue Network was sold in 1941 and became the Amer. Broadcasting Co. (ABC). NBC continued to lead the networks with its popular comedy, variety, and drama programs, but in the late 1940s it lost several leading performers to CBS in a talent raid. NBC entered television broadcasting in a weakened position, and by 1952 it trailed CBS in audience ratings, though it gradually regained its leading position. In 1986 RCA was sold to GE; in 1987 NBC sold its radio networks.


tic
Sudden rapid, recurring muscle contraction--usually a blink, sniff, twitch, or shrug--always brief, irresistible, and localized. Frequency decreases from head to foot. Unlike a spasm, a cramp, or the movements of chorea or epilepsy, it does not interfere with other movement and can be held off for a time. It can become ingrained as a habit of which the person (most often a nervous child 5-12 years old) is unaware. Most tics are probably psychological, but similar movements occur in some physical disorders (e.g., late-stage encephalitis). People with tics have some control over the movement but feel impelled to go through with it to feel better. Tension increases the movement's likelihood, and distraction reduces it. ...

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