from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Symbol for the megasecond, an SI unit of time equal to 106 seconds.
- n. A title used before an adult female's name or surname instead of Miss or Mrs.
Pre-19th century contraction of "Mistress" (http://www.buffalonews.com/opinion/columns/missmanners/index.html); widely adopted by feminists from the 1970s onwards as a non-sexist title that does not reveal or assume the marital status of the woman to which it is applied, by analogy with Mr, which functions in this way. (Wiktionary)