WRONG:

ALUMNUS/ALUMNI

We used to have "alumnus" (male singular), "alumni" (male plural), "alumna" (female singular) and "alumnae" (female plural); but the latter two are now popular only among older female graduates, with the first two terms becoming unisex. However, it is still important to distinguish between one alumnus and a stadium full of alumni. Never say "I am an alumni" if you don't want to cast discredit on your school.

List of errors