(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 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

The process of creating the content of a document or other content item, i.e., writing or composition. / The result of this process; a writing or composition.

Explicitly allowed.

simple past tense and past participle of authorize

(transitive) To grant (someone) the permission or power necessary to do (something). / (transitive) To permit (something), to sanction or consent to (something).