We didn't adopt the term sorority untill 1904 or 1914 (can't remember which) when we officially became a national organization. I used it as a sorority info tidbit on a newsletter last year. I'll look it up if you want.
No, I appreciate it. I just had one of those.. WHA? moments when I thought about the timing. (based on one of those annoyingly classist posters over there in Greek Life.. grrr)