>>>Is it? Co-Educational is derogatory?
>>
>>"Educated WITH"... the guys who are getting educated. You, ladies, are let into the sand box TOO, WITH these guys. If they weren't there, we wouldn't really know how to call you. You are an afterthought. You need to have a different term applied so we'd know you aren't real students, you're only educated along with them.
>>
>>Find me one college for ladies which was converted into a mixed one, and where male students are now called co-eds, and I'll retract this.
>
>I wasn't referring to the women as co-eds. I was referring to the situation as co-educational - ie - applies to both males and females. You shouldn't go assuming that what you might have meant by using a phrase is what everybody must mean by using it.

OK, there really ARE two meanings to it:

co-ed

1. (US, dated, informal) A young woman who attends college.
2. (US, dated, informal) A (generally young) woman, especially on the campus of a college or other educational institute.

http://en.wiktionary.org/wiki/co-ed