What is the greek word for family reunion?

There isn't one single Greek word that perfectly translates to "family reunion." Greek doesn't have a word that encapsulates the specific social event of a family reunion the way English does.

You would need to use a descriptive phrase, such as:

* Οικογενειακή συνάντηση (Oikogeneiaki synantisi): This translates literally to "family meeting" and is probably the closest single phrase.

* Συνάντηση συγγενών (Synantisi syggenon): This means "meeting of relatives" and is a more accurate description of the event.

The best choice depends on the context. If you're talking about a planned gathering, `Οικογενειακή συνάντηση` is suitable. If you want to emphasize the kinship aspect, `Συνάντηση συγγενών` is better.