The monthly recurring date of a past event, especially one of historical, national, or personal importance. Often referred to as a "month anniversary." This is wrong, because "anniversary" comes from the root "ano" meaning year, while "menoversary" comes from "meno" meaning month.
I asked my girlfriend out on October 24th, 2005. Our 1st menoversary is on Thanksgiving, and our 2nd menoversary will be on Christmas Eve.
by The One True Kaiser November 22, 2005