Dimension---di as 'dai' or 'di', or both are standard pronunciation?
I would say that both "die-men-shun" and "duh-men-shun" are frequently used. The only one that I don't think you hear very much would be with the "di" pronounced as it is in "did". But it's entirely possible that people pronounce it like that too, and I've simply not heard it.
I know what you mean, 'di' has a short 'er' sound rather than a 'di' as in did. However, i cannot find any dictionary say it can be pronounced as [dai'menʃәn]. That is why I am asking if it is right for people to pronounce like that.