causal loop

"Philosophy for Beginners" を読んでいます。

Arthur travels to the future in a time machine and steals the blueprint for a time machine. He then goes back and gives it to Professor Wells, who uses it to build the time machine that took Arthur to the future. This scenario involves something called a causal loop. That's when events ultimately seem to cause themselves.

"causal loop" の "causal" が最初は何の形容詞か分かりませんでしたが、辞書を見たら直ぐに元の単語は "cause" だと分かりました。
・Oxford English Dictionary: (formal) connected with the relationship between two things, where one causes the other to happen: the causal relationship between poverty and disease
・Collins Dictionary: If there is a causal relationship between two things, one thing is responsible for causing the other thing.: Rawlins stresses that it is impossible to prove a causal link between the drug and the deaths.
・Cambridge English Dictionary: a relationship, link, etc. between two things in which one causes the other: Is there a causal relationship between violence on television and violent behaviour?