2 definitions by The red willows com

The celebration of two years.

(not to be mistaken with dianniversary)
They got together on christmas 2005, so their bianniversary was on christmas 2007.
by The red willows com June 17, 2009
The celebration of half an anniversary.

(not to be mistaken with bianniversary)
They got together on christmas, so their dianniversary would be june 25th.
by The red willows com June 17, 2009

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