Word of Basque origin with varied etymology. I tend towards aker ( male goat ) and larre ( prado ) the meadow of the goat next to the cave of Zugarramurdi in Baztan ( Navarre ) where a car of faith against witches who allegedly met in the cave was held at the beginning of the 17TH century. Since then a coven is a gathering of witches with the goat, in popular belief encouraged by religious power. Also a collusion, conspiracy, conspiracy or meeting of conspirators or evil people live with evil intentions or go you know.