intrinsic

adj

1. Innate, inherent, inseparable from the thing itself, essential.

   “the intrinsic value of gold or silver”

   “the intrinsic merit of an action”

   “He was better qualified than they to estimate justly the intrinsic value of Grecian philosophy and refinement.”

2. Situated, produced, secreted in, or coming from inside an organ, tissue, muscle or member.
3. Built-in.

   “In addition to the Fortran operators that are intrinsic (built in), there may be user-defined operators in expressions.”

noun

1. A built-in function that is implemented directly by the compiler, without any intermediate call to a library.

   “SIMD intrinics”

   “Crappy loops, we got them: Use vector intrinsics¶ For troublesome loops that just don't vectorize even with hints, vector intrinsics are another option.”

2. An ability possessed by a character and not requiring any external equipment.

   “You can acquire the fire-resistance intrinsic by eating dragon meat.”