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'Authority' is defined on dictionary.com as:
The power to enforce laws, exact obedience, command, determine, or judge.

You CONVENIENTLY left out the more appropriate definitions from that site. Let me help you choose the correct definition.

1.
a. The power to enforce laws, exact obedience, command, determine, or judge.
b. One that is invested with this power, especially a government or body of government officials: land titles issued by the civil authority.

2. Power assigned to another; authorization: Deputies were given authority to make arrests.

3. A public agency or corporation with administrative powers in a specified field: a city transit authority.

4.
a. An accepted source of expert information or advice: a noted authority on birds; a reference book often cited as an authority.
b. A quotation or citation from such a source: biblical authorities for a moral argument.

5. Justification; grounds: On what authority do you make such a claim?

6. A conclusive statement or decision that may be taken as a guide or precedent.

7. Power to influence or persuade resulting from knowledge or experience: political observers who acquire authority with age.

8. Confidence derived from experience or practice; firm self-assurance: played the sonata with authority.