The meaning of Maranatha in the Bible
(From International Standard Bible Encyclopedia)

mar-a-nath'-a, mar-an-a'-tha (from Aramaic words, marana' 'athah, "Our Lord cometh, or will come"; according to some, "has come"; to others, "Come!" an invitation for his speedy reappearance (compare Revelation 22:20); maranatha, or maran atha): Used in connection with anathema, "accursed" (I Corinthians 16:22), but has no necessary connection therewith. It was used by early Christians to add solemn emphasis to previous statement, injunction or adjuration, and seems to have become a sort of watchword; possibly forming part of an early liturgy.

See more on the meaning of Maranatha in the Bible:
Maranatha {Easton's Bible Dictionary}
Maranatha {Hitchcock's Bible Name}

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