nar·cis·sism (närs-szm) also nar·cism (-szm) n. 1. Excessive love or admiration of oneself. 2. A psychological condition characterized by self-preoccupation. 3. Erotic pleasure derived from contemplation or admiration of one's own body or self, especially as a fixation on or a regression to an infantile stage of development. 4. The attribute of the human psyche characterized by admiration of oneself but within normal limits. [After Narcissus.] narcis·sist n. narcis·sistic adj. narcis·sisti·cal·ly adv.