built so as to be an integral and permanent part of a larger construction

The wall has a built-in bookcase.

existing as a natural or characteristic part of something; inherent

a built-in contempt for daydreaming.

a built-in piece of furniture or appliance.

an additional feature or capability, as of a machine or a service

a car with power steering, power brakes, and other built-ins.

adjective

added , extra , not included

adjective

congenital , constitutional , deep-seated , essential , implicit , inborn , inbred , in-built , incorporated , indwelling , ingrained , inherent , innate , inseparable , integral , part and parcel , component , constituent , connatural , elemental , indigenous , intrinsic , native , natural