Medical Definition of narcissistic personality disorder. : a personality disorder characterized especially by an exaggerated sense of self-importance, persistent need for admiration, lack of empathy for others, excessive pride in achievements, and snobbish, disdainful, or patronizing attitudes.
For the purposes of sym metry, letâs now move on to the most common variant of syn- , or sym- , which also means âtogether.â A sym phony is the sounding âtogetherâ of many instruments.
Definition of SYNERGISM. : interaction of discrete agencies (as industrial firms), agents (as drugs), or conditions such that the total effect is greater than the sum of the individual effects.See synergism defined for kids.ADVERTISEMENT.edical Definition of SYNERGISM. : interaction of discrete agents (as drugs) such that the total effect is greater than the sum of the individual effectsâcalled also synergy; compare antagonism b.