Definitions of minister:

• noun:   the job of a head of a government department
• noun:   a diplomat representing one government to another; ranks below ambassador
• noun:   a person appointed to a high office in the government

  Example: "Minister of Finance"

• noun:   a person authorized to conduct religious worship
• verb:   work as a minister

  Example: "She is ministering in an old parish"

• verb:   attend to the wants and needs of others

  Example: "I have to minister to my mother all the time"

• name:  A surname (very rare: popularity rank in the U.S.: #70004)