Connection
Relation
noun, verbal noun, の adjective
A connection related to another connection obviously has some kind of connection, at least between all those meanings.
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.
人間関係
human relationships, related to humans
対人関係
interpersonal relations
仕事関係
related to work
事実関係
relation to truth
関係を作る
to establish a relationship
関係を持つ
to have relations with someone, to have connections with
関係を考える
to consider the relationship
関係者
person who is involved with something
関係性
relation, relationship
関係上
in light of a relationship, in terms of a relationship
仕事の関係
business relations, relating to work
時間の関係
relating to time
二人の関係
the relationship between the two
関係がある
there is a relationship
関係ができる
to establish a relationship
関係が分かる
to learn what the relationship is, to understand the relationship
ご関係
relationship
二人はどういう関係なの？
What kind of relationship do you two have?
それは今は関係ないでしょ？
That's irrelevant now, right?
ビエトはヤクザとズブズブの関係らしいよ。
It seems like Viet has a deep connection with the yakuza.