Gigahertz is a term that refers to a billion cycles per second and relates to computer technology, radio communication, and other electronic devices. Synonyms for the word gigahertz include GHz, gigacycle per second, and gigacycle. Other synonyms that refer to frequencies in the same range as gigahertz include terahertz, megahertz, and kilohertz. Terahertz refers to a trillion cycles per second, megahertz refers to one million cycles per second, and kilohertz refers to one thousand cycles per second. Although these terms are used interchangeably, they tend to describe slightly different ranges of frequencies and are often used for different applications.