relativism

The theory that value judgments, as of truth, beauty, or morality, have no universal validity but are valid only for the persons or groups holding them.

The philosophical doctrine of the relativity of knowledge. See relativity.

The theory, especially in ethics or aesthetics, that conceptions of truth and moral values are not absolute but are relative to the persons or groups holding them.

A specific such theory, advocated by a particular philosopher or school of thought.

(philosophy) the philosophical doctrine that all criteria of judgment are relative to the individuals and situations involved