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1.
An absense of existence, a thing that has no existence
My love life is completely nonexistent.
by KnJC25 April 01, 2008
 
2.
not existing. seemingly not there. missing. gone. absent.
Derrick's relationship with his 16 year old brother was almost nonexistent. They barely talked and he didn't really want him interfering with his life.
by darksongbird March 21, 2009