committee: [15] Committee was formed from the verb commit by adding the suffix -ee. Following the pattern of all such formations, it originally meant ‘person to whom something is committed’; it was not until the 17th century that the sense ‘body of people delegated to perform a particular function’ developed. [committee etymology, committee origin, 英语词源]
1620s, from commit + -ee, or else a revival of Anglo-French commite, past participle of commettre "to commit," from Latin committere "to unite, connect" (see commit). Originally "person to whom something is committed" (late 15c.); from 17c. in reference to a body of such people.