senior partner

noun [C]

Definition

› a member of a group of people, companies, countries, etc. that has more power and influence than other members: When the US and Japan discuss rules for financial services, Japan is now almost the senior partner. It was clear who the senior partner in the arrangement was.

› one of the people who has reached the top rank in a partnership: She is a senior partner in a New York law firm.

→ Compare junior partner

(Definition of senior partner noun from the Cambridge Business English Dictionary © Cambridge University Press)