a fixation, often sexual, on a particular object, body part, etc.; sexual desire or arousal in which fulfillment is very strongly linked to specific objects;
e.g. He has a fetish for women wearing high heels.
(noun)
an object that is believed to have magical powers because it is inhabited by a spirit;
e.g. He carried around a stone that he considered to be a fetish because he believed it is inhabited by his dog's soul.