noun
powerful person; influential figure
Refers to a person of great authority and influence, often from a prestigious family or high social standing. Slightly formal and literary.
彼は政界の権門勢家として知られている。
He is known as a powerful figure in the political world.
有力者 is a more common and neutral term for an influential person, while 権門勢家 carries a nuance of inherited status and formal authority.
Compound of 権門 (けんもん, 'powerful family') and 勢家 (せいか, 'influential house'). The exact historical derivation is uncertain, but the term is conventionally associated with describing individuals from dominant clans or political circles.