1) a public office which a citizen undertakes to administer at
    his own expense
 2) any service
    2a) of military service
    2b) of the service of workmen
    2c) of that done to nature in the cohabitation of man and wife
 3) biblical usage
    3a) a service or ministry of the priests relative to the
        prayers and sacrifices offered to God
    3b) a gift or benefaction for the relief of the needy