This is the 1462nd most frequent Catalan word.
tria
"Tria" means "choice" or "selection" in English.
Here, 'tria' refers to the act of selecting something among options.
La tria del millor llibre és complicada.
Choosing the best book is complicated.
In this instance, 'tria' is used as a verb meaning 'to choose' or 'to select' in the present tense, specifically third person singular.
Ella tria cada dia la seva roba amb molta cura.
She chooses her clothes carefully every day.
Here, 'tria' functions as a noun referring to the process or event of making a choice.