Reunion (noun)

1. A gathering of people who have been separated, especially a gathering of family members or old friends.
2. The process of coming together again after a period of separation.

Origin:

From the french réunion meaning a gathering, from old french reunion meaning a coming together, from re- + union meaning a union.

Examples:

1. The family held a reunion to celebrate their parents' 50th wedding anniversary.
2. The reunion was emotional as they hadn't seen each other in 10 years.
3. The alumni reunion was a great opportunity to catch up with old friends.
4. The high school reunion was a chance to reminisce about old times.
5. The reunion brought back many happy memories for everyone.