A unit of measurement of one cycle per second when one radio wave passes one point in one second of time. Named in honor of Heinrich Hertz, the physicist who developed the theory of radio waves. One kilohertz (1 kHz) is one thousand cycles per second; one megahertz (1 MHz) is one million cycles per second; and one gigahertz (1 GHz) is one billion cycles per second. (Cingular)
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