"intrinsic" in the adjective sense
1. intrinsic, intrinsical
belonging to a thing by its very nature
"form was treated as something intrinsic, as the very essence of the thing"- John Dewey
2. intrinsic
situated within or belonging solely to the organ or body part on which it acts
"intrinsic muscles"
Source: WordNet® (An amazing lexical database of English)
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