A high officer of state appointed to head an executive or administrative department of government. To attend to the wants and needs of others: Volunteers ministered to the homeless after the flood. See Synonyms at tend2. To perform the functions of a cleric. To administer or dispense (a sacrament, for example). One who is authorized to perform religious functions in a Christian church, especially a Protestant church. Roman Catholic Church The superior in certain orders. An authorized diplomatic representative of a government, usually ranking next below an ambassador. A person serving as an agent for another by carrying out specified orders or functions.