What is the meaning of Primero?

A card game resembling poker, dating back at least to the 16th century.

neuter of primeru

first (ahead of others)

earliest

foremost; ranking before others

first in a series

first

first (first up)

first

first; first of all; firstly

former (in contrast to the latter), first, first one

one of the five bids in the card game of Primero, consisting of a combination of four cards in the hand

first, first up

top (head)

chief, fundamental

prime, initial, front

first; first of all; firstly

masculine of primera

Source: wiktionary.org