auth.

Of the same origin as claimed; genuine.

“The experts confirmed it was an authentic signature.”

Conforming to reality and therefore worthy of trust, reliance, or belief.

“The report was completely authentic.”

(of a Gregorian mode) Having the final as the lowest note of the mode.

Authoritative

The originator or creator of a work, especially of a literary composition.

“Have you read any Corinthian authors?”

Someone who writes books for a living.

One's authority for something: an informant.

The power to enforce rules or give orders.

“I have the authority to penalise the staff in my department, but not the authority to sack them.”

(used in singular or plural form) Persons in command; specifically, government.

A person accepted as a source of reliable information on a subject.

“the world's foremost authority on orangutans”

Government-owned agency which runs a revenue-generating activity.

To grant (someone) the permission or power necessary to do (something).

“The General Assembly authorized the Council to take up the matter.”

To permit (something), to sanction or consent to (something).

“The judge authorized the wiretapping.”

Explicitly allowed.