This is the 2662nd most frequent Portuguese word.
noção
Idea, concept, or understanding.
In this sentence, 'noção' refers to understanding or awareness regarding the problem-solving approach.
Ele não tinha nenhuma noção de como resolver o problema.
He had no notion of how to solve the problem.
Here, 'noção' means a general understanding or clue about an event that occurred.
Você tem alguma noção do que aconteceu ontem à noite?
Do you have any idea of what happened last night?
In this context, 'noção' refers to an interpretation or personal conception of a concept, specifically time.