1. The absence or insufficiency of power, command, or legitimate right to make decisions or enforce obedience
The teacher's lack of authority made it difficult to maintain classroom discipline.
A falta de autoridade do professor dificultava manter a disciplina na sala de aula.
2. Absence of credibility or legitimacy in a position of leadership or command
His lack of authority on the subject made people question his expertise.
Sua falta de autoridade sobre o assunto fez as pessoas questionarem sua expertise.