built-in
US /ˌbɪltˈɪn/
UK /ˌbɪltˈɪn/
1.
included as part of something and not separate from it
:
•
The new car has a built-in navigation system.
•
The apartment comes with built-in wardrobes.
2.
existing as a natural or essential part of something
:
•
There's a built-in risk in any investment.
•
The system has built-in safeguards against errors.