Of or pertaining to an office or position of duty, trust, or authority: An official language is one that is used by the government of a country when making its laws, in official documents, etc. : How to use official in a sentence. Appointed, authorized, or … Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. See examples of official used in a sentence. Definition of official adjective in oxford advanced learners dictionary. If gatorade is the official drink of the olympics, somebody with authority has signed some papers and a deal has been made. Ambtenaar (government official), by louis dusée, utrecht, 1961 an official is someone who holds an office (function or mandate, regardless of whether it carries an actual working space … If something is official, its authorized and approved by somebody. The meaning of official is one who holds or is invested with an office : A person appointed or elected to an office or charged with certain duties.