Narcissism is the pursuit of gratification from vanity or egotistic admiration of one's own attributes. The term originated from Greek mythology, where the young Narcissus fell in love with his own image reflected in a pool of water.
In general, synergy (pronounced SIN-ur-jee, from Greek sunergia, meaning cooperation, and also sunergos, meaning working together) is the combined working together of two or more parts of a system so that the combined effect is greater than the sum of the efforts of the parts.
Word Origin and History for synergy Expand n. 1650s, cooperation, from Modern Latin synergia, from Greek synergia joint work, assistance, help, from synergos working together, related to synergein work together, help another in work, from syn-together (see syn-) + ergon work (see urge (v.)).