corecomponent
nounUK /ˈkɔː.kəm.pəʊ.nənt/
US /ˈkɔːr.kəm.poʊ.nənt/
A core component is a very important part that a whole thing needs to work.
The battery is a core component of the toy robot.
OTHER MEANINGS
2. The central processing unit or main part of a computer system.
The processor is a core component of the laptop.
3. A fundamental building block in a design or plan.
Trust is a core component of a good friendship.
4. A required piece in a machine or device.
The engine is a core component of the car.