This is the 11119th most frequent French word.
primo
"Primo" is an informal term in French meaning "firstly" or "first of all."
Here, 'primo' introduces a first point or step in reasoning or explanation, indicating sequence.
Primo, il faut comprendre les bases.
First, we must understand the basics.
In this case, 'primo' describes the initial occurrence of the vaccination procedure, indicating priority or occurrence in time.
Il a été primo vacciné contre la grippe.
He was first vaccinated against the flu.
Again, 'primo' is used as an introductory word to start the list of reasons or arguments, emphasizing the sequence.