built-in

[bilt-in] /ˈbɪltˌɪn/
adjective
1.
built so as to be an integral and permanent part of a larger construction:
The wall has a built-in bookcase.
2.
existing as a natural or characteristic part of something; inherent:
a built-in contempt for daydreaming.
noun
3.
a built-in piece of furniture or appliance.
4.
an additional feature or capability, as of a machine or a service:
a car with power steering, power brakes, and other built-ins.
Origin
1895-1900
British Dictionary definitions for built-ins

built-in

adjective
1.
made or incorporated as an integral part: a built-in cupboard, a built-in escape clause
2.
essential; inherent
noun
3.
(Austral) a built-in cupboard or wardrobe