Gigacycle per second is a term used in computing and describes the frequency of a processor's clock. It is commonly abbreviated as GHz. There are several synonyms for the term, including billion cycles per second, gigahertz, or simply Hz. Gigahertz is the most common synonym for GHz, and it is often used interchangeably with gigacycle per second. Other related terms to gigacycle per second are terahertz, megahertz, and kilohertz. In summary, gigacycle per second simply means the frequency at which a processor is clocked and is often expressed in different units such as gigahertz or billion cycles per second.