keyidea
nounUK /ˈkiː aɪˈdɪə/
US /ˈkiː aɪˈdiːə/
The most important thought in a story or plan.
The key idea of the book is that friends help each other.
OTHER MEANINGS
2. The main thing you want people to remember.
Our key idea for the party is to have fun together.
3. The most important part of a lesson.
The teacher wrote the key idea on the board.
4. The central thought that holds a plan together.
The key idea behind the game is teamwork.