Meanings of great oz in English

AOL was the Great Oz of our office.

Is the great Oz behind the curtain?

"To the Emerald City," said Dorothy, "to see the Great Oz."

"We came here to see the Great Oz," said Dorothy.

The second time was when she had fought against the Great Oz himself, and driven him out of the land of the West.

I am the Guardian of the Gates, and since you demand to see the Great Oz I must take you to his Palace.

But, because he did not believe that he did, the Great Oz had to go through the motions of presenting him with one.

Here, in public, the man actually seemed hurt, defensive of his mechanical oracle... which the people of the valley still revered like great Oz.

Meanwhile, John Rubinstein as the Great Oz edges ever closer to a world in which Artur is known primarily for being father to the son.

"We will go to the Emerald City and ask the Great Oz how to get back to Kansas again."

"Here are strangers," said the Guardian of the Gates to him, "and they demand to see the Great Oz."

"I am going to the Great Oz to ask him to give me some," remarked the Scarecrow, "for my head is stuffed with straw."