noun, の adjective
When you exist outside (outside of what? Japan, of course), you are overseas or abroad.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
How do you manage your overseas assets?
We are currently checking on the safety of Japanese residents abroad.
Before casting an overseas ballot, you have to submit an application to the Japanese embassy or the Japanese consulate.