I know that is the common, modern spelling so I double checked it.
http://www.catholicculture.org/culture/library/dictionary/index.cfm?letter=R
I think they misspelled it!...................
In the definition the spell it correctly!:
In philosophy, the view that there is no absolute truth or certitude. It is claimed that truth depends entirely on variable factors such as person, place, time, and circumstances. Moral -—— relativism -—— holds that there are no unchangeable principles of human behavior, either because all truth is relative or becaue there are no inherently evil actins, sicne everything depends on other factors, such as customs, conventions, or social approval.