meaning of jackpot in Longman Dictionary of Contemporary English

Mary Jane Wins Big in Her First Appearance as Jackpot in jakpot in The jackpot winner matched all six main numbers to take the large sum, but no players matched five numbers plus the bonus ball to win the £1 jakpot in The jackpot winner matched all six main numbers to take the large sum, but no players matched five numbers plus the bonus ball to win the £1

jakpot in A Powerball player in New Jersey was one number shy of hitting the $45M jackpot during the Monday, June 17, drawing They won $1 million