RICHARD: There are two meanings to the word ‘authority’ and
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the one that causes all the troubles is the one connected with power.
- (The power of the authority to enforce obedience; the power of the authority to enforce moral or legal judgements; the power of the authority to command or give the final decision; the power of the authority to control; the power of the authority of a governing body; the power of an authoritative holy book; the power of the authority to inspire belief and so on).
- The second – less used – meaning is: an expert on a particular subject.
http://actualfreedom.com.au/richard/selectedcorrespondence/sc-authority.htm