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4.
The first anniversary from breaking up with an asshole where you go out and party.
"Today is my my one-year anti-versary of being away from that dick ex-husband of mine. Let's go celebrate."
by SharieD April 18, 2010
 
1.
{n} a contraction of 'anti' and 'anniversary'. The date of a breakup/divorce, etc.
September 6th is my antiversary.
by Elendae August 26, 2006
 
2.
The anniversary of one's breakup. Sometimes celebrated by people with a sense of humor.
Justin isn't your antiversary coming up?
by hasi August 26, 2006
 
3.
What would have been an anniversary but is not due to a divorce or getting laid off.
Today is my 25th Antiversary.
by meloruff December 09, 2010