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.
When something is synergistic, it means various parts are working together to produce an enhanced result. If youâve just heard a synergistic symphony, the musicians must have played very well together. Youâve probably heard the phrase âmore than the sum of its parts.â The prefix syn- means together with or united..