This is the 2569th most frequent Japanese word.
対外
"Foreign; external (related to foreign countries)."
The word "対外" is used here to describe "foreign" pertaining to relations or exchanges outside the country.
日本は対外関係を大切にしています。
Japan values its foreign relations.
"対外" in this case describes something external or dealing with matters outside an organization or country.
彼の立場は対外的なものです。
His position is related to external affairs.
In this sentence, "対外" implies an orientation or interaction outward to external entities.