Official
Part of speech: adjective
Definition: Of or pertaining to an office or public trust Derived from the proper office or officer, or from the proper authority; made or communicated by virtue of authority Approved by authority; authorized. sanctioned by the pharmacopoeia; appointed to be used in medicine; officinal Discharging an office or function. Relating to an office; especially, to a subordinate executive officer or attendant. Relating to an ecclesiastical judge appointed by a bishop, chapter, archdeacon, etc., with charge of the spiritual jurisdiction.
Part of speech: noun
Definition: An office holder invested with powers and authorities. A person responsible for applying the rules of a game or sport in a competition.
Example sentence: There are few ironclad rules of diplomacy but to one there is no exception. When an official reports that talks were useful, it can safely be concluded that nothing was accomplished.
Established
Part of speech: verb
Definition: To make stable or firm; to confirm.
Example sentence: The attitude of the West and of Russia towards a crisis like Ukraine is diametrically different. The West is trying to establish the legality of any established border. For Russia, Ukraine is part of the Russian patrimony.