noun
senior advisor; chief advisor
A high-ranking advisory position in an organization, often an honorary or senior role given to experienced individuals.
彼は会社の最高顧問に就任した。
He was appointed senior advisor to the company.
最高顧問として、長年の経験を活かして助言を行っている。
As a senior advisor, he provides advice drawing on his many years of experience.
顧問 is a general advisor, while 最高顧問 is the highest-ranking or most senior advisor.
Compound of 最高 (highest) and 顧問 (advisor).