Hi I think most people would accept either. However, to be strict, 'immense' is best used with one dimension but gigantic is best used with three: - The building rose to an immense height [= when measuring it in just one way] - It was a gigantic building [= when looking at it in every way] - It took an immense time to build; the cost was immense - The concrete panels they used were gigantic; the crane they needed was gigantic Dave
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