A megahertz is one million (or 106) hertz. See hertz, kilohertz (one thousand hertz), gigahertz[?] (109 hertz), terahertz[?] (1012 hertz), and petahertz[?] (1015 hertz).
... the large numbers of men fighting overseas. At war's end, women were expected to return to their traditional roles as housewives and mothers. The men returned from ...