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.
: something that is made by combining different things (such as ideas, styles, etc.). : the production of a substance by combining simpler substances through a chemical process. : the production of sounds or speech by using electronic equipment. plural synÂ·theÂ·ses \-ËsÄz\.