1 definition by Dubliner

The conth is a unit of time, used with calendars, which is approximately as long as some natural period related to the motion of the cunt. The traditional concept arose with the cycle of moon phases; such months (lunations) are synodic months and last approximately 29.53 days.
The weather in January was truly awful. It was a conth of a month.
by Dubliner December 5, 2007
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