the.com/moral relativism

means The view that right and wrong aren't fixed absolutes but depend on the beliefs, culture, or circumstances of whoever's judging — there's no view from nowhere, only views from somewhere.

from The phrase stitches together 'moral' (Latin 'moralis,' Cicero's own coinage to translate the Greek 'ēthikos,' having to do with custom and character) and 'relativism,' from Latin 'relativus,' 'relative' — bearing on or dependent on something else. As a named philosophical position, 'moral relativism' crystallized in 19th- and 20th-century debates, partly fed by anthropologists documenting how wildly ethical codes vary across cultures. The idea itself is far older — Herodotus noted that every people thinks its own customs best — but the tidy label is a modern academic coinage for a very old observation.