This is the 13657th most frequent Spanish word.
reunirán
"They will gather" or "They will meet."
The verb "reunirán" indicates future tense for "reunir(se)", used reflexively to describe the students gathering together.
Los estudiantes se reunirán en el auditorio para el evento.
The students will gather in the auditorium for the event.
Here "reunirán" emphasizes the pre-planned action of convening.
Todos los invitados se reunirán en la sala principal antes de la ceremonia.
All the guests will meet in the main hall before the ceremony.
In this sentence, "reunirán" highlights a future collective action of coming together for a celebration.