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(1) Speculative short-term growth of capitalist industry and trade. A boom is characterized by an increase in prices of goods and in the rate of exchange of securities, raging stock market speculation, and so on. In imperialist countries booms are closely linked with the arms race.
(2) In a figurative sense, excessive and unfounded (artificially created) excitement over some measure, event, person, and so forth; a ballyhoo or sensation.
ii. Any long and substantially tubular portion of structure linking major parts of an aircraft like the tail to the wing or in helicopters linking the tail rotor to the fuselage.
iii. A sonic boom, or sound, heard whenever an aircraft flying at speeds above or equal to the speed of sound passes in the near vicinity.
iv. A horizontal support for the elements of a directional antenna.