A megahertz is one million (or 106) hertz. See hertz, kilohertz (one thousand hertz), gigahertz[?] (109 hertz), terahertz[?] (1012 hertz), and petahertz[?] (1015 hertz).
... or royal family. Of the more specific uses of the term, the most common include: 1. A supporter of King Charles I of England during the English Civil War. 2. ...