Relativism

Relativism refers to any of several similar philosophical concepts:
 * Moral relativism : holds that "moral or ethical propositions do not reflect objective and/or universal moral truths, but instead make claims relative to social, cultural, historical or personal circumstances." It is in opposition to moral absolutism.
 * Cultural relativism : is the methodological principle in anthropology that "an [individual's] beliefs and activities should be interpreted in terms of his or her own culture."
 * Cognitive relativism (or epistemological relativism) : "claims the truth or falsity of a statement is relative to a social group or individual."
 * Aesthetic relativism : is an aesthetic philosophy that "the judgement of beauty is relative to individuals, cultures, time periods and contexts, and that there are no universal criteria of beauty." (Somewhat less controversial than the other three.)

Because of the similar sounding name, Einstein's (completely unrelated) theory of relativity can sometimes be confused with these more-controversial philosophical positions.