Frequency: The word is one of the 700 most common words in English.
A ~ is a person who is employed to do office work, such as typing letters, answering phone calls, and arranging meetings.
The ~ of an organization such as a trade union, a political party, or a club is its official manager. (BRIT)
My grandfather was ~ of the Scottish Miners’ Union.
The ~ of a company is the person who has the legal duty of keeping the company’s records.
Secretary is used in the titles of ministers and officials who are in charge of main government departments.
...the British Foreign Secretary.
...Defense Secretary Caspar Weinberger.