Source : Webster's Revised Unabridged Dictionary (1913)

Maranatha \Mar`a*nath"a\, n. [Aramaic m[=a]ran ath[=a].]
   ``Our Lord cometh;'' -- an expression used by St. Paul at the
   conclusion of his first Epistle to the Corinthians (xvi. 22).
   This word has been used in anathematizing persons for great
   crimes; as much as to say, ``May the Lord come quickly to
   take vengeance of thy crimes.'' See {Anathema maranatha},
   under {Anathema}.