I've been thinking about this recently because I don't think I have a good understanding. I feel like I understand the textbook definition but not how it applies to real life. It's generally defined as "understanding that morality is not fixed/objective, is malleable, and changes throughout time/cultures" etc, however, I feel like I often get roped into a discussion wherein a party is trying to convince me that if I think someone from Culture A is being immoral AT ALL then I can't possibly adhere to moral relativism. I believe that you can accept that different cultures have different means of measuring morality without FINDING those things moral. You can observe their units of measurement without adopting them, if you will.