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1.
Immortal; existed before the creation of Arda
Meaning: 'Father of All'
Other Names: Eru
Titles: The One
The name among Elves of Eru, the One, from whom the Ainur had their being.
Through the Music of the Ainur, Ilúvatar created the World and the beings who inhabit it, and only he fully knows its fate.
by Amedee "ILUVATAR" Van Gasse September 22, 2003
 
2.
The one, the greatest.

GOD of the Arda, Ea.
deployed the valar to create a beautiful land for his sons, humans.
Iluvatar bless you
by abbas tolgay yilmaz June 28, 2009