This is the 106th most frequent Italian word.
scorso
"Scorso" means "last" or "past" (referring to time, e.g., last week, past month).
Here, 'scorsa' modifies 'settimana' to indicate the previous week.
La settimana scorsa sono andato al cinema.
Last week, I went to the cinema.
Here, 'scorsi' modifies 'anni' to describe the years that have passed.
Durante gli anni scorsi, ho imparato molto.
During the past years, I have learned a lot.
In this case, 'scorso' modifies 'film' to signify the last one viewed.