noun
Refers to the state of a personal relationship between people, often used in phrases like 仲がいい (close) or 仲が悪い (on bad terms).
彼とは子供の頃から仲がいい。
I've been close with him since we were kids.
最近、あの二人は仲が悪いらしい。
It seems those two have been on bad terms lately.
関係 is a broader term for connections, associations, or formal relationships, while 仲 specifically refers to the quality of personal relationships between individuals.
The kanji 仲 is composed of 人 (person) and 中 (middle), suggesting a person in the middle or a relationship between people. The reading なか is a native Japanese word.