Derived from 'ridiculous' ridicality is a scale of the sheer absurdity of something. Normally measured on a scale of 0-10 or expressed as having a high (or low) level of ridicality.
"Can you believe the ridicality of removing that article from Wikipedia as 'patent nonsense'?!"
The plural of ridiculous, meaning exceptionally ridiculous so much so that saying ridiculous is not enough to express the ridiculousness of the situation
If your mum came up to you and bitchslapped you to put you back in your place. That would be a suitable time to say; "That is absolutely ridiculi"