"Decree" is itself a six-letter word, meaning "proclamation" or "edict".
Writ
fiat
Ukaz, which is Russian for Decree. Since Russia has been a toltalitarian society for much of it's history this is a well known word and is often used by writers in English and French.
The root word of authoritative is "authority."
charge, behest, decree
The root of "edict" is from the Latin word "edictum," which means a formal or authoritative proclamation or decree issued by a person in a position of authority, such as a ruler or government official.
A four letter word starting with the letter a is able.
Fiat -noun 1.an authoritative decree, sanction, or order: a royal fiat. 2.a formula containing the word fiat, by which a person in authority gives sanction. 3.an arbitrary decree or pronouncement, esp. by a person or group of persons having absolute authority to enforce it: The king ruled by fiat.
A four letter word for 'in addition to' is also.
That Four-Letter Word was created in 2006.
Lard is a four letter word for grease.
A four letter word for Seizures is moon