This is the 433rd most frequent Romanian word.
fostul
"Fostul" in English means "the former" or "ex-".
Here, 'fostul' means 'former' and denotes something that was previously the case, referring to the now-previous state of being a 'colleague.'
Fostul meu coleg de cameră s-a mutat în alt oraș.
My former roommate moved to another city.
In this context, 'fostul' is associated with 'teacher' to suggest that the person previously held this role, emphasizing past relevance.
Am auzit că fostul nostru profesor s-a pensionat recent.
I heard that our former teacher recently retired.
Here, 'fostul' qualifies 'minister,' indicating that the person previously occupied this position, now describing it as a past role.