This is the 97th most frequent Portuguese word.
serão
"Serão" can mean overtime work or an evening gathering/event, depending on context.
Here, 'serão' is the future tense form of the verb 'ser', used to indicate that they (third person plural) will experience a state or condition in the future.
Eles serão promovidos no próximo mês.
They will be promoted next month.
Here, 'serão' is the future passive voice of the verb 'ser', indicating that the works will experience an action performed by an agent in the future.
Os trabalhos serão avaliados pelo professor.
The works will be evaluated by the teacher.
Here, 'serão' is used in the future tense to describe a foreseen state or action that the parents will experience.