This is the 951st most frequent Catalan word.
reunir
"Reunir" means "to gather" or "to bring together."
In this sentence, 'reunir' is used reflexively ('es reuneixen') to mean 'to meet', indicating a regular gathering of people.
Ells es reuneixen cada setmana per discutir els projectes.
They meet every week to discuss the projects.
Here, 'reunir' is used transitively ('va reunir') to mean 'to gather', referring to the act of collecting people together.
Va reunir tots els seus amics per a la festa sorpresa.
He gathered all his friends for the surprise party.
In this example, 'reunir' is applied in a context of accumulating or collecting something tangible, such as money.