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1.
The power of pushing your opinion onto people or situations.
"Imma let you finish, but..."

Kanye West demonstrated his power of opinionation at the 2009 VMA awards.
by XakkMaster October 24, 2009
 
2.
a meeting of people, discussing opinions of world news.
Hey Mike, are you going to the annual Opinionation at the school hall
by 786hvhf March 07, 2010