MHz stands for megahertz, which measures the frequency of a signal in millions of cycles per second. Some synonyms for MHz include "megacycle per second," "million cycles per second," and "megaherz." These words are often used interchangeably, but they all describe the same fundamental concept of measuring signal frequency in multiples of 1 million. Other related terms may include "hertz" (measuring frequency in cycles per second, rather than millions), "gigahertz" (measuring frequency in billions of cycles per second), and "terahertz" (measuring frequency in trillions of cycles per second). Regardless of which term you use, they all describe the same basic concept of measuring frequency for various types of signals, including radio waves, electromagnetic radiation, and more.