The term "cycles per second" is commonly used in science and engineering to refer to the frequency of a repeating event, such as a sound wave or an electrical signal. However, there are several synonyms for this term that can be used interchangeably depending on the context. Some of these include hertz, Hz, megahertz, MHz, and gigahertz, GHz. Hertz (Hz) is the most commonly used term and is defined as one cycle per second. Megahertz (MHz) and gigahertz (GHz) are used to describe higher frequencies, with 1 MHz equaling 1 million cycles per second and 1 GHz equaling 1 billion cycles per second. These terms are important for understanding and measuring a wide range of phenomena in the modern world.