1. A formal, ceremonial, or officially prescribed way of conducting oneself or handling matters in accordance with established protocols and procedures
The ambassador greeted the president in an official manner.
O embaixador saudou o presidente de forma oficial.
2. A professional and proper demeanor appropriate for official business or formal occasions
She spoke in an official manner during the press conference.
Ela falou de maneira oficial durante a coletiva de imprensa.