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1.
Rights used by nobles of the past to have sexual rights to the wife of a man newly married on the night of their wedding.
The Lord excerised his rights of Prima Nocta to take the man's wife for himself on her wedding night.
by Benjamin Johnson April 30, 2006
 
2.
when you claim first rights to hook up with or hit on everybody at a party you're hosting. i.e. sexual firsties
{while at your casa during a party} yo dude, i totally call prima nocta on that hot chick over there.
by samtino March 07, 2011