reunite
v.to come together again after being apart for a long time.
v.to bring together or come together again after a period of separation. Often used in the context of family members, political groups, or lost items.
“The two sisters will reunite at the airport tomorrow.”
“After twenty years of living in different countries, the family finally managed to reunite for a holiday.”
“The diplomatic mission aims to reunite the fractured provinces under a single administrative body, though historical grievances continue to complicate the peace process.”
Can be used transitively ('reunite the family') or intransitively ('the family reunited').
When used intransitively to mean 'come together', the verb does not require a reflexive pronoun.
“Diego Simeone, beginning his 15th full season in charge of Atlético, reunites with Mourinho in the dugout for the Madrid derby.”
“Now they’ve been separated, and no one will tell them when – or if – they’ll be reunited.”
From re- + unite.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.