Connection, Relevance, Correlation, Association
Noun, Suffix, する verb, and の adjective
かんれん
IT関連の仕事をしています。
I do IT related work.
この問題に関連したメールは、全部コウイチに回してください。
Please assign all emails related to this matter to Koichi.
大気汚染と異常気象の関連を調査する仕事をしています。
My job is to investigate the relationship between air pollution and abnormal weather.
If you take along some things that are related, you'll be able to understand their relation better.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.