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A couple's 6 month anniversary (similar to a half birthday).
Prem and Becky got married on July 11th, so they celebrated their halfiversary on January 11th.
by Premdawg January 11, 2011
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Like an Anniversary, but a celebration for six months in a relationship, friendship, etc..
Hey babe, its been six months! Happy Halfiversary!!
by Anonymously Jay October 13, 2016
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