n. 25B6; adjective
an official inquiry : AUTHORIZED, approved, validated, authenticated, certified, accredited, endorsed, sanctioned, licensed, recognized, accepted, legitimate, legal, lawful, valid, bona fide, proper, ex cathedra; informal kosher.
an official function : CEREMONIAL, formal, solemn, ceremonious; bureaucratic; informal stuffed-shirt.
unauthorized, informal.
25B6; noun a union official : OFFICER, office-holder, administrator, executive, appointee, functionary; bureaucrat, mandarin; representative, agent; Brit. jack-in-office; derogatory apparatchik.