Cause
Origin, Source
noun, verbal noun
The original cause is how you got into this mess. Forget all the things it caused, the first cause is the origin and source of what's going on right now. You can pinpoint one thing that caused all of this!
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.
愛情からではなく金のためにけっこんしたのが原因で、けんかがたえず、結局りこんしてしまいました。
Since we married for money, not for love, we fought a lot and ended up getting divorced.
原因不明の山火事で、町は大変なことになっています。
Due to the wildfire of unknown origins, the town has been in such a chaotic situation.
心配ないよ。ビエトがすでに不具合の原因を突き止めて、現在修復作業中だよ。
Don’t worry. Viet has already uncovered the cause of the bugs and is fixing it right now.