From what I understand about Iluvatar, he is like a God figure, the Great Spirit, if you will, that is before all and runs through all things he creates. I don't know that Tolkien ever expanded on Iluvatar very much since I don't have a copy of his Letters. Then again, how could you really elaborate on God? Tolkien was writing to a basically Christianised world who had some basic ideas about God, such as His eternal Self, so perhaps he thought they would be familiar enough with the entity of Iluvatar.
Peace
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'Dulaman na Binne Bui, Dulaman Gaelach/ Dulaman na farraige, 's e b'fhearr a bhi in Eirinn!'
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