basicreason
nounUK /ˌbeɪsɪk ˈriːzən/
US /ˌbeɪsɪk ˈrizən/
The main reason is the biggest why for something.
The basic reason we wear coats is to stay warm.
RELATED WORDS
OTHER MEANINGS
2. The simplest explanation for why something happens.
The basic reason the plant died was that nobody watered it.
3. The first or most important cause behind a choice.
The basic reason she picked the red bike was that it was her favorite color.
4. A plain, easy-to-understand cause.
The basic reason the team won was that they practiced every day.