bo ‧ nan ‧ za /bəˈnænzə, bəʊ- $ bə-, boʊ-/ BrE AmE noun [countable]
[ Date: 1800-1900 ; Language: Spanish ; Origin: 'good weather' , from Medieval Latin bonacia , changed from Latin malacia 'calm at sea' , from Greek , from malakos 'soft' ]
a lucky or successful situation where people can make a lot of money:
2008 was a bonanza year for the oil industry.
an amazing cash bonanza