The noble scholar Abdur-Rahman Ibn Naasir As-Sa'dee Rahimahullaah, said:
"Know that Tawheed in the unrestricted sense, is the knowledge and the ackowledgement, that the Lord Allaah, is singled out with all the attributes of Perfection. And it is to affir that He is singled out with all the Attributes of Greatness and Majesty. And it is to single Him out alone with all worship..."
Source: Tanscripted from Explanation of Kitaab ut-Tahweed (explnatory tapes sets) by Daawood Burbank; part 1
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