This is the 365th most frequent Portuguese word.
primeiros
"Primeiros" means "first ones" or "first" in English.
In this sentence, 'primeiros' refers to the sequence, indicating the initial days of the school term.
Os primeiros dias de aula são sempre empolgantes.
The first days of school are always exciting.
Here, 'primeiros' is used to identify the individuals who arrived ahead of others, denoting precedence.
Eles foram os primeiros a chegar na festa.
They were the first ones to arrive at the party.
In this instance, 'primeiros' designates the exercises that appear at the beginning of a list or sequence.