noun
A person of high social rank, often from a noble family. Used in both historical and modern contexts.
彼はイギリスのアリストクラットの家系に生まれた。
He was born into a family of English aristocrats.
貴族 is the native Japanese word for 'noble' or 'aristocrat', more common in historical or formal contexts, while アリストクラット is a loanword often used with a slightly more Western or stylish nuance.
Borrowed from English 'aristocrat'.