Anthropologists studying female circumcision might personally be horrified by the practice, but must also be able to suspend their own personal judgment in order to understand the beliefs and practices of others within their cultural context. what is this known as

This is known as cultural relativism.
Cultural relativism refers to the fact that customs and beliefs of foreign nations should be considered objectively, within that particular culture, rather than your own culture. So, anthropologists who are studying female circumcision should be objective when it comes to this controversial topic because even though that may not be acceptable in their own culture, it is acceptable in some other cultures.