Innate, inborn.
Born or originating in, native to a land or region, especially before an intrusion.
In particular, of or relating to a people (or their language or culture) that inhabited a region prior to the arrival of people of other cultures which became dominant (e.g., through colonialism), and which maintains a distinct culture.
Built-in.
Innate, inherent, inseparable from the thing itself, essential.
Situated, produced, secreted in, or coming from inside an organ, tissue, muscle or member.
A built-in function that is implemented directly by the compiler, without any intermediate call to a library.
An ability possessed by a character and not requiring any external equipment.