Source : Webster's Revised Unabridged Dictionary (1913)

Harmonist \Har"mo*nist\, Harmonite \Har"mo*nite\, n. (Eccl.
   Hist.)
   One of a religious sect, founded in W["u]rtemburg in the last
   century, composed of followers of George Rapp, a weaver. They
   had all their property in common. In 1803, a portion of this
   sect settled in Pennsylvania and called the village thus
   established, Harmony.