Look up "intrinsic."
Anything else, professor?
Main Entry: in·trin·sic Pronunciation: in-'trin-zik, -'trin(t)-sik Function: adjective Etymology: Middle French intrinsèque internal, from Late Latin intrinsecus, from Latin, adverb, inwardly; akin to Latin intra within -- more at INTRA- 1 a : belonging to the essential nature or constitution of a thing b : being or relating to a semiconductor in which the concentration of charge carriers is characteristic of the material itself instead of the content of any impurities it contains 2 a : originating or due to causes within a body, organ, or part b : originating and included wholly within an organ or part