A megahertz is one million (or 106) hertz. See hertz, kilohertz (one thousand hertz), gigahertz[?] (109 hertz), terahertz[?] (1012 hertz), and petahertz[?] (1015 hertz).
... for the Reformed churches in Germany was established under the Peace of Westphalia, in 1648, but political difficulties at the end of the 17th century almost ...