dim-i-noo-shun
Here's how to break it down:
* dim: The "i" is short, like in "dim" light.
* i: The "i" is short, like in "it".
* noo: The "oo" is long, like in "moon".
* shun: The "shun" sounds like the ending of the word "mention".
Let me know if you'd like to hear it pronounced!