noun
friendly relations; friendship
Used for amicable ties between individuals, groups, or nations. Often appears with verbs like 築く (build), 結ぶ (form), or 保つ (maintain).
両国は長年にわたって友好関係を築いてきた。
The two countries have built friendly relations over many years.
隣人との友好関係を保つことは大切だ。
It is important to maintain friendly relations with your neighbors.
Compound of 友好 (friendship) + 関係 (relations). The exact historical derivation is uncertain, but the word follows standard Sino-Japanese compounding patterns.