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