official

official is an Adverb

Definition:

[1] Of or pertaining to an office or public trust; as, official duties, or routine. That, in the official marks invested, you Anon do meet the senate. Shak.

[2] Derived from the proper office or officer, or from the proper authority; made or communicated by virtue of authority; as, an official statement or report.

[3] Approved by authority; sanctioned by the pharmacopoeia; appointed to be used in medicine; as, an official drug or preparation. Cf. Officinal.

[4] Discharging an office or function. [Obs.] The stomach and other parts official unto nutrition. Sir T. Browne.