(uncountable) Permission. / (countable) An act of authorizing. / (countable) (A document giving) formal sanction, permission or warrant.

plural of authorization

(uncountable) Power or right to make or enforce rules or give orders; or a position having such power or right.

The originator or creator of a work, especially of a literary composition. / Someone who writes books for a living. / (obsolete, criminal law) Principal.

(chiefly US, sometimes proscribed) To create a work as its author.

plural of author

Third-person singular simple present indicative form of author

plural of authority

The bodies that have political or administrative power and control in a particular sphere / The bodies that enforce law and order or provide a public service

present participle of author