Authority as you feel is derived from auctoritas that is a Latin word meaning advice, influence, command, invention or opinion. It has different meaning in English which defines that it can be used to signify power that is given by the state (in in the form of judges, police officers and members of parliament, etc.), having knowledge related to academics of a particular area.
In government terms, authority it is seen as a parallel with “power”. Both has different meanings that states “power” is something that influences others to change his or her mind to do something that they do not want or not have done, while “authority” refers to that supremacy of having legitimate power and the right and justification to use that power. For instance, while a group of people has the power to punish a criminal, whereas some think that only a court of law can enforce that punishment.
Authority in a Democratic State
Each state has number of institutions that use authority that is based on legal practices. Not only this, all states have various agencies which are strong in dealing with one at a time. All that is arranged within your grounds. One such an instance would be an authority related to development is Delhi development authority. They are usually created by special power and are usually run by board of directors. Many such institutions and agencies are invented that have same power and position. All is created to be self supporting in nature through various taxes or some other forms of funds or collection of fees.