IPA: /ˌær.ɪˈstɒk.rə.si/
KK: /ˌærɪˈstɒkrəsi/
A social class that is considered to be the highest in society, often made up of people with noble titles or inherited wealth.
In the past, the aristocracy held significant power and influence over the government and society.
Aristocracy → It is formed from "aristo-" (from Greek "áristos", meaning best or excellent) and "-cracy" (from Greek "kratos", meaning power or rule). The word refers to a form of government in which power is held by the best individuals or a privileged class.
Think of 'the best' ('aristo-') having 'power' ('-cracy') — that's why aristocracy means rule by the best.