auth.
adjective
Definitions
Of the same origin as claimed; genuine.
Example: The experts confirmed it was an authentic signature.
Conforming to reality and therefore worthy of trust, reliance, or belief.
Example: The report was completely authentic.
(of a Gregorian mode) Having the final as the lowest note of the mode.
Authoritative
noun
Definitions
The originator or creator of a work, especially of a literary composition.
Example: Have you read any Corinthian authors?
Someone who writes books for a living.
One's authority for something: an informant.
noun
Definitions
The power to enforce rules or give orders.
Example: 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.
Example: the world's foremost authority on orangutans
Government-owned agency which runs a revenue-generating activity.
verb
Definitions
To grant (someone) the permission or power necessary to do (something).
Example: The General Assembly authorized the Council to take up the matter.
To permit (something), to sanction or consent to (something).
Example: The judge authorized the wiretapping.
adjective
Definitions
Explicitly allowed.