Opportunity, Turning Point
Noun
けいき
吐血したのを契機に、煙草を止めました。
Coughing up blood was my opportunity to give up smoking.
I pledge myself to the machines. It is my only chance to survive the upcoming machine apocalypse.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.