How to Say "to reunite" in Spanish
The Spanish word for “to reunite” is “reunirnos” — A2 level. This is a very common word in everyday Spanish.

Examples
Debemos reunirnos para discutir el proyecto.
We should meet up to discuss the project.
Es difícil reunirnos todos los domingos.
It is difficult for us to get together every Sunday.
Queremos reunirnos con la familia en Navidad.
We want to get together with the family at Christmas.
The 'nos' Ending
The 'nos' at the end of the word means 'us' or 'ourselves'. It shows that the action of gathering is happening to the group of people speaking.
When to stick it on the end
You attach 'nos' to the end of the verb when it's in its base form (like 'reunir'), usually after words like 'querer' (to want) or 'necesitar' (to need).
Missing the 'nos'
Mistake: “Queremos reunir mañana.”
Correction: Queremos reunirnos mañana.
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