of a university
whose ostensible purpose is to be a parent figure
to a floor of building of coeds
living in a dormitory
or residence hall
. Usually an RA
gets free room and board in exchange for preserving order and being a person students can go to when they have problems.
It's possible that sometimes an RA is using his or her social status to seduce younger coeds, but such rumors are completely unsubstantiated.