The word aristocratic describes a person the highest level of society — such as a prince or a duke — or those people or things that are so distinguished that they seems to belong to that group.
First used around the 1560s, the adjective aristocratic has origins in the Greek word aristokratia, meaning "government, rule of the best." An aristocratic person usually gains this social status through birthright rather than demonstrated merit. Aristocratic can describe someone or something belonging to this group, like an aristocratic estate or an aristocratic leader, but it can also describe something grand and elegant. You might have an aristocratic expression on your face as you attend a formal party.