This is the 942nd most frequent Portuguese word.
primeiras
"Primeiras" means "first ones" in English.
In this sentence, 'primeiras' indicates the initial occurrence of events, specifically the rains.
As primeiras chuvas trouxeram alívio após a seca.
The first rains brought relief after the drought.
Here, 'primeiras' is used to describe the initial group of individuals she interacted with in a temporal order at the event.
Ela cumprimentou as primeiras pessoas que encontrou no evento.
She greeted the first people she met at the event.
'Primeiras' here refers to the ordinal position of the classes within the week, indicating 'first' in sequence.