Retrouvailles
Etymology
French, a plural noun from the verb "retrouver" ("to find again, to meet again"). Literally "refindings," it names the reunion and its accompanying gladness together. It is the emotional counterpart to the sorrow of parting.
noun ยท /ruh-troo-VYE/
The joy of reuniting with someone after a long time apart.
What it names
That flood of happiness in the first moments of seeing a loved one again after a long separation.
Example
After a year on opposite coasts, our retrouvailles at the airport left us both in tears.
Related idea
If reunion names the event neutrally, retrouvailles names the feeling the event produces.