noun
circle of friends; one's relationships; people one knows
Refers to the network of people one associates with socially, including friends and acquaintances.
彼は交友関係が広い。
He has a wide circle of friends.
新しい土地で交友関係を築くのは大変だ。
It's tough to build new relationships in a new place.
Compound of 交友 (friendship, companionship) and 関係 (relation, connection).