If there is a preposition following authority, it is often "of" indicating the source of authority. The prepositions "in" or "for" would indicate the scope of authority.
These letters unscramble to spell the word authority.
Apparent Authority
The possessive form of "authority" is "authority's."
Is the word authority a verb
Give authority to another
To have authority over something.
He is an authority in his field.
undermine
The word authority means a legal format of doing thing or the decision making.
powerless
The word for someone against authority is rebel.