This is the 7766th most frequent Portuguese word.
primo
"Cousin"
Here the word 'primo' is used in its primary meaning to refer to a male cousin, a relative connected through one's uncle or aunt.
Meu primo vai me visitar no sábado.
My cousin will visit me on Saturday.
In this sentence, 'primo' metaphorically refers to pioneers or important contributors in a particular field.
Eles tornaram-se primos no desenvolvimento de novas tecnologias.
They became pioneers in the development of new technologies.
The word 'primo' here is used informally to describe someone as a beginner or novice in a certain activity or area.