basesystem

noun
UK /ˈbeɪsˌsɪstəm/
US /ˈbeɪsˌsɪstəm/

A base system is the main set of parts that everything else is built on.

The computer's base system helps all the other programs run.


OTHER MEANINGS

2. The basic set of software that a computer needs to start and run other programs.

The technician reinstalled the base system before adding new apps.

3. A fundamental group of parts or rules that other things depend on.

The base system of the game includes the rules and the board.

4. The simplest level of a structure, before any extras are added.

They started with the base system and later added more features.