In the Big Bang vs Big Blow dispute, I have found that it's about "Time dialation in light curves", "Time dialition in light curves" and "time dilation of light curves".

I have always thought (and the dictionary says so), that it would rather be "dilatation", but then I've been wrong before.

So, which one would it be? Dial-a-tion, Dialition (aka dialysis) or dilation (and unilation)?