Imzadi - The Betazoid Concept Of Beloved

Of all the many alien races depicted on the various Star Trek shows and in the movies, those of the planet Betazed may be the most romantic one of all.  The Deltans - first seen in ST: The Motion Picture - could be considered the most sexual, but for the similarly telepathic and empathetic Betazoids, there's a concept they call Imazdi - translated basically as one's beloved.

In The Next Generation, Counselor Deanna Troi calls her new crewmate Will Riker her Imzadi - right off the bat in the pilot, Encounter As Farpoint.  These two were romantically linked before their tour of duty on Captain Picard's Galaxy class starship, and that blazing romantic torch song never really ended. By the time of their marriage in Star Trek: Nemesis, Riker and Troi have seen the ups and downs of a romance which could only be properly encapsulated by the concept of Imzadi.  Interesting note:  A platonic love or deep friendship can also be characterized as Imzadi.