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HERTZ, HZ Definition We define HERTZ, HZ HERTZ, HZ - Cycles per second. Used to describe the cycle rate in radio, electronics, and audio. Abbreviated Hz, and often combined with numeric prefixes, such KHz, MHz, GHz, and so on. Named for the German physicist Heinrich Hertz, who discovered electromagnetic waves. # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z